invalidFunctionArg
ftp://ftp.de.debian.org/debian/pool/main/p/patch/patch_2.8.orig.tar.xz
head patch-2.8/src/util.c:540:15: warning: Either the condition 'fd<0' is redundant or close() argument nr 1 can have invalid value. The value is -1 but the valid values are '0:'. [invalidFunctionArg]