Silence MacOS compiler warning

[stefanrueger]

See here for details

[mcuee]

Yes this PR is good to go, no more warnings.

mcuee@mcuees-Mac-mini avrdude_sr % git checkout silence-macos-ull-warning
branch 'silence-macos-ull-warning' set up to track 'origin/silence-macos-ull-warning'.
Switched to a new branch 'silence-macos-ull-warning'
mcuee@mcuees-Mac-mini avrdude_sr % ls
AUTHORS			INSTALL			build.sh		patch.txt
CMakeLists.txt		NEWS			build_darwin		src
CMakeSettings.json	README.md		build_new_libedit.sh	supporting-docs
COPYING			atmel-docs		build_readline.sh	tools
mcuee@mcuees-Mac-mini avrdude_sr % rm -rf build_darwin 
mcuee@mcuees-Mac-mini avrdude_sr % ./build.sh 
-- The C compiler identification is AppleClang 15.0.0.15000309
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /Library/Developer/CommandLineTools/usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Found Git: /opt/homebrew/bin/git (found version "2.44.0")
-- Found FLEX: /usr/bin/flex (found version "2.6.4")
-- Found BISON: /usr/bin/bison (found version "2.3")
-- Looking for libelf.h
-- Looking for libelf.h - not found
-- Looking for libelf/libelf.h
-- Looking for libelf/libelf.h - found
-- Looking for usb.h
-- Looking for usb.h - found
-- Looking for lusb0_usb.h
-- Looking for lusb0_usb.h - not found
-- Looking for libusb.h
-- Looking for libusb.h - not found
-- Looking for libusb-1.0/libusb.h
-- Looking for libusb-1.0/libusb.h - found
-- Looking for hidapi/hidapi.h
-- Looking for hidapi/hidapi.h - found
-- Looking for ftdi_tcioflush
-- Looking for ftdi_tcioflush - found
-- Configuration summary:
-- ----------------------
-- DO HAVE    libelf
-- DO HAVE    libusb
-- DO HAVE    libusb_1_0
-- DO HAVE    libhidapi
-- DON'T HAVE libftdi
-- DO HAVE    libftdi1
-- DO HAVE    libreadline
-- DO HAVE    libserialport
-- DISABLED   doc
-- DISABLED   parport
-- DISABLED   linuxgpio
-- DISABLED   linuxspi
-- ----------------------
-- Configuring done (6.2s)
-- Generating done (0.1s)
-- Build files have been written to: /Users/mcuee/build/avr/avrdude_test/avrdude_sr/build_darwin
[  1%] Generating avrdude.conf
[  1%] Built target conf
[  2%] [FLEX][Parser] Building scanner with flex 2.6.4
[  3%] [BISON][Parser] Building parser with bison 2.3
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/Users/mcuee/build/avr/avrdude_test/avrdude_sr/build_darwin/lexer.c:2435:38: warning: comparison of integers of different signs: 'yy_size_t' (aka 'unsigned long') and 'int' [-Wsign-compare]
        if (((yy_n_chars) + number_to_move) > YY_CURRENT_BUFFER_LVALUE->yy_buf_size) {
             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~  ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
[ 93%] Building C object src/CMakeFiles/libavrdude.dir/__/config_gram.c.o
[ 94%] Linking C static library libavrdude.a
[ 94%] Built target libavrdude
[ 96%] Building C object src/CMakeFiles/avrdude.dir/main.c.o
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[ 98%] Building C object src/CMakeFiles/avrdude.dir/whereami.c.o
[100%] Linking C executable avrdude
[100%] Built target avrdude

Build succeeded.

Run

sudo cmake --build build_darwin --target install

to install.