sbin/camcontrol/camcontrol.c error breaks buildworld

In r350018 for a buildworld I am running into :

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cc --sysroot=/usr/obj/usr/src/r350018/powerpc.powerpc64/tmp 
-B/usr/obj/usr/src/r350018/powerpc.powerpc64/tmp/usr/bin  -O2 -pipe 
-I/usr/src/r350018/sbin/nvmecontrol -DWITH_NVME -DRESCUE -MD 
-MF.depend.camcontrol.o -MTcamcontrol.o -std=gnu99 
-fstack-protector-strong -Wsystem-headers -Werror -Wall -Wno-format-y2k 
-W -Wno-unused-parameter -Wstrict-prototypes -Wmissing-prototypes 
-Wpointer-arith -Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch 
-Wshadow -Wunused-parameter -Wcast-align -Wchar-subscripts -Winline 
-Wnested-externs -Wredundant-decls -Wold-style-definition 
-Wno-pointer-sign       -c /usr/src/r350018/sbin/camcontrol/camcontrol.c 
-o camcontrol.o
cc1: warnings being treated as errors
/usr/src/r350018/sbin/camcontrol/camcontrol.c: In function 'getdevtype':
/usr/src/r350018/sbin/camcontrol/camcontrol.c:679: warning: comparison 
of unsigned expression < 0 is always false
*** Error code 1

Stop.
make[6]: stopped in /usr/src/r350018/sbin/camcontrol
*** Error code 1

Stop.
make[5]: stopped in /usr/obj/usr/src/r350018/powerpc.powerpc64/rescue/rescue
*** Error code 1

Stop.
make[4]: stopped in /usr/src/r350018/rescue/rescue
*** Error code 1

Stop.
make[3]: stopped in /usr/src/r350018/rescue
*** Error code 1

Stop.
make[2]: stopped in /usr/src/r350018
*** Error code 1

Stop.
make[1]: stopped in /usr/src/r350018
*** Error code 1

Stop.
make: stopped in /usr/src/r350018
#

Anyone else seeing this ?

-- 
Dennis Clarke
RISC-V/SPARC/PPC/ARM/CISC
UNIX and Linux spoken
GreyBeard and suspenders optional