firmware-utils: mkzcfw: fix compiler warnings/errors
mkzcfw.c:130:21: error: unused variable ‘board’ [-Werror=unused-variable]
mkzcfw.c:318:37: error: pointer targets in passing argument 1 of ‘cyg_crc32’ differ in signedness [-Werror=pointer-sign]
mkzcfw.c:338:37: error: pointer targets in passing argument 1 of ‘cyg_crc32’ differ in signedness [-Werror=pointer-sign]
mkzcfw.c:346:41: error: pointer targets in passing argument 1 of ‘cyg_crc32’ differ in signedness [-Werror=pointer-sign]
mkzcfw.c:280:11: error: unused variable ‘crc’ [-Werror=unused-variable]
mkzcfw.c:279:6: error: unused variable ‘writelen’ [-Werror=unused-variable]
mkzcfw.c:366:8: error: unused variable ‘outfile’ [-Werror=unused-variable]
mkzcfw.c:364:6: error: unused variable ‘err’ [-Werror=unused-variable]
mkzcfw.c:176:2: error: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Werror=unused-result]
Signed-off-by: Petr Štetiar <ynezz@true.cz>