Re: [PATCH v6 06/13] bisect--helper: reimplement `bisect_next` and `bisect_auto_next` shell functions in C

"Miriam R." [off-list ref] writes:

I don't know if it is something related to my compiler but my -Werror
build does not break.

FWIW, here is a full compilation command line from "make V=1" for
the file:

cc -o builtin/bisect--helper.o -c -MF builtin/.depend/bisect--helper.o.d -MQ builtin/bisect--helper.o -MMD -MP -Werror -Wall -Wdeclaration-after-statement -Wformat-security -Wold-style-definition -Woverflow -Wpointer-arith -Wstrict-prototypes -Wunused -Wvla -Wextra -Wmissing-prototypes -Wno-empty-body -Wno-missing-field-initializers -Wno-sign-compare -Wno-unused-parameter  -g -O2 -Wall -I. -DHAVE_SYSINFO -DGIT_HOST_CPU="\"x86_64\"" -DHAVE_ALLOCA_H  -DUSE_CURL_FOR_IMAP_SEND -DSHA1_DC -DSHA1DC_NO_STANDARD_INCLUDES -DSHA1DC_INIT_SAFE_HASH_DEFAULT=0 -DSHA1DC_CUSTOM_INCLUDE_SHA1_C="\"cache.h\"" -DSHA1DC_CUSTOM_INCLUDE_UBC_CHECK_C="\"git-compat-util.h\"" -DSHA256_BLK  -DHAVE_PATHS_H -DHAVE_DEV_TTY -DHAVE_CLOCK_GETTIME -DHAVE_CLOCK_MONOTONIC -DHAVE_GETDELIM '-DPROCFS_EXECUTABLE_PATH="/proc/self/exe"'  -DFREAD_READS_DIRECTORIES -DNO_STRLCPY -DSHELL_PATH='"/bin/sh"' -DPAGER_ENV='"LESS=FRX LV=-c"'  builtin/bisect--helper.c
builtin/bisect--helper.c: In function 'bisect_next':
builtin/bisect--helper.c:570:6: error: variable 'no_checkout' set but not used [-Werror=unused-but-set-variable]
  570 |  int no_checkout;
      |      ^~~~~~~~~~~
cc1: all warnings being treated as errors