new gcc warning

Hi

I see a new warning in upstream

r/include/libxml2 -c -o path.o path.c
path.c: In function ‘has_drive_prefix’:
path.c:89:26: warning: self-comparison always evaluates to false
[-Wtautological-compare]
return skip_drive(path) != path;
^~
Regards

[pavel(at)nemesis postgresql]$ gcc --version
gcc (GCC) 6.1.1 20160621 (Red Hat 6.1.1-3)
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Regards

Pavel