Problem with r226035 - in head/usr.bin/grep: . regex?

I noted the following after updating head to r226035:

...
>>> stage 4.4: building everything
...
cc -O2 -pipe  -Dxregcomp=regcomp -Dxre_exec=re_exec -Dxregexec=regexec -Dxre_search=re_search -Dxre_compile_fastmap=re_compile_fastmap -Dxregerror=regerror -Dxre_comp=re_comp -Dxre_set_syntax=re_set_syntax -DHAVE_CONFIG_H -DRL_NO_COMPAT -DMI_OUT=1 -DTUI=1 -I. -I/usr/src/gnu/usr.bin/gdb/libgdb/../arch/i386 -I/usr/src/gnu/usr.bin/gdb/libgdb/../../binutils/libbfd -I/usr/src/gnu/usr.bin/gdb/libgdb/../../binutils/libbfd/i386 -I/usr/src/gnu/usr.bin/gdb/libgdb/../../../../contrib/gdb/gdb -I/usr/src/gnu/usr.bin/gdb/libgdb/../../../../contrib/gdb/gdb/config -I/usr/src/gnu/usr.bin/gdb/libgdb/../../../../contrib/binutils/include -I/usr/src/gnu/usr.bin/gdb/libgdb/../../../../contrib/gdb/include -I/usr/src/gnu/usr.bin/gdb/libgdb/../../../../contrib/binutils/bfd -std=gnu99 -fstack-protector  -c /usr/src/gnu/usr.bin/gdb/libgdb/../../../../contrib/gdb/gdb/tui/tui-source.c
cc1: warnings being treated as errors
/usr/src/usr.bin/grep/regex/tre-fastmatch.c: In function 'tre_match_fast':
/usr/src/usr.bin/grep/regex/tre-fastmatch.c:961: warning: comparison of unsigned expression < 0 is always false
*** Error code 1
1 error
*** Error code 2
1 error
*** Error code 2


[I'm sorry, but I won't be in position to test fixes until after my
laptop comes back from repair.]

Peace,
david
-- 
David H. Wolfskill				david_at_catwhisker.org
Depriving a girl or boy of an opportunity for education is evil.

See http://www.catwhisker.org/~david/publickey.gpg for my public key.