buildworld fails with warning in usr.bin/diff/diffreg.c

The error is:

--- all_subdir_usr.bin ---
cc1: warnings being treated as errors
/home/vagrant/src/usr.bin/diff/diffreg.c: In function 'change':
/home/vagrant/src/usr.bin/diff/diffreg.c:1085: warning: 'i' may be
used uninitialized in this function
--- all_subdir_share ---
--- ucred.9.gz ---
gzip -cn /home/vagrant/src/share/man/man9/ucred.9 > ucred.9.gz
--- uidinfo.9.gz ---
gzip -cn /home/vagrant/src/share/man/man9/uidinfo.9 > uidinfo.9.gz
--- uio.9.gz ---
gzip -cn /home/vagrant/src/share/man/man9/uio.9 > uio.9.gz
--- all_subdir_usr.bin ---
*** [diffreg.o] Error code 1

make[4]: stopped in /home/vagrant/src/usr.bin/diff
1 error

make[4]: stopped in /home/vagrant/src/usr.bin/diff
--- all_subdir_share ---
A failure has been detected in another branch of the parallel make

make[5]: stopped in /home/vagrant/src/share/man/man9
--- all_subdir_usr.bin ---
*** [all_subdir_usr.bin/diff] Error code 2

make[3]: stopped in /home/vagrant/src/usr.bin
1 error
--- all_subdir_share ---
*** [all_subdir_share/man/man9] Error code 2

make[4]: stopped in /home/vagrant/src/share/man
1 error

make[4]: stopped in /home/vagrant/src/share/man
*** [all_subdir_share/man] Error code 2

make[3]: stopped in /home/vagrant/src/share
1 error

make[3]: stopped in /home/vagrant/src/share
--- all_subdir_usr.bin ---

make[3]: stopped in /home/vagrant/src/usr.bin
--- all_subdir_share ---
*** [all_subdir_share] Error code 2

make[2]: stopped in /home/vagrant/src
--- all_subdir_usr.bin ---
*** [all_subdir_usr.bin] Error code 2

make[2]: stopped in /home/vagrant/src
--- all_subdir_lib ---
A failure has been detected in another branch of the parallel make

make[8]: stopped in /home/vagrant/src/lib/libcasper/services/cap_grp/tests
*** [grp_test] Error code 2

make[7]: stopped in /home/vagrant/src/lib/libcasper/services/cap_grp/tests
1 error

make[7]: stopped in /home/vagrant/src/lib/libcasper/services/cap_grp/tests
*** [all_subdir_lib/libcasper/services/cap_grp/tests] Error code 2

make[6]: stopped in /home/vagrant/src/lib/libcasper/services/cap_grp
1 error

make[6]: stopped in /home/vagrant/src/lib/libcasper/services/cap_grp
*** [all_subdir_lib/libcasper/services/cap_grp] Error code 2

make[5]: stopped in /home/vagrant/src/lib/libcasper/services
1 error

make[5]: stopped in /home/vagrant/src/lib/libcasper/services
*** [all_subdir_lib/libcasper/services] Error code 2

make[4]: stopped in /home/vagrant/src/lib/libcasper
1 error

make[4]: stopped in /home/vagrant/src/lib/libcasper
*** [all_subdir_lib/libcasper] Error code 2

make[3]: stopped in /home/vagrant/src/lib
1 error

make[3]: stopped in /home/vagrant/src/lib
*** [all_subdir_lib] Error code 2

make[2]: stopped in /home/vagrant/src
--- all_subdir_usr.sbin ---
A failure has been detected in another branch of the parallel make

make[4]: stopped in /home/vagrant/src/usr.sbin/ctld
*** [all_subdir_usr.sbin/ctld] Error code 2

make[3]: stopped in /home/vagrant/src/usr.sbin
1 error

make[3]: stopped in /home/vagrant/src/usr.sbin
*** [all_subdir_usr.sbin] Error code 2

make[2]: stopped in /home/vagrant/src
4 errors

make[2]: stopped in /home/vagrant/src
*** [everything] Error code 2

make[1]: stopped in /home/vagrant/src
1 error

make[1]: stopped in /home/vagrant/src
*** [buildworld] Error code 2

make: stopped in /home/vagrant/src
1 error

make: stopped in /home/vagrant/src

Command exit status: 2

++++++++++++++++++++++++++++





This is what the code snippet in the file looks like when error is encountered:

vagrant_at_freebsd12current:~/src/usr.bin/diff % awk 'NR>=1080&&NR<=1090' diffreg.c
change(char *file1, FILE *f1, char *file2, FILE *f2, int a, int b, int c, int d,
    int *pflags)
{
        static size_t max_context = 64;
        long curpos;
        int i, nc;
        const char *walk;

restart:
        if ((diff_format != D_IFDEF || diff_format == D_GFORMAT) &&
            a > b && c > d)

++++++++++++++++++++++++++++





The following snippet removes the error during build:

vagrant_at_freebsd12current:~/src/usr.bin/diff % awk 'NR>=1080&&NR<=1091' diffreg.c
change(char *file1, FILE *f1, char *file2, FILE *f2, int a, int b, int c, int d,
    int *pflags)
{
        static size_t max_context = 64;
        long curpos;
        int i, nc;
        int 0;
        const char *walk;

restart:
        if ((diff_format != D_IFDEF || diff_format == D_GFORMAT) &&
            a > b && c > d)

++++++++++++++++++++++++++++





vagrant_at_freebsd12current:~/src % svnlite info
Path: .
Working Copy Root Path: /home/vagrant/src
URL: svn://svn.freebsd.org/base/head
Relative URL: ^/head
Repository Root: svn://svn.freebsd.org/base
Repository UUID: ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Revision: 317257
Node Kind: directory
Schedule: normal
Last Changed Author: bde
Last Changed Rev: 317256
Last Changed Date: 2017-04-21 15:12:43 +0000 (Fri, 21 Apr 2017)