links.c: Fix build with gcc-12
Fix the build failure with gcc-12 when -Og pass to CFLAGS.
| /build/tmp-glibc/work/corei7-64-wrs-linux/kronosnet/1.22-r0/recipe-sysroot/usr/include/bits/string_fortified.h:59:10: error: 'link' may be used uninitialized [-Werror=maybe-uninitialized] | 59 | return __builtin___memset_chk (__dest, __ch, __len, | | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | 60 | __glibc_objsize0 (__dest)); | | ~~~~~~~~~~~~~~~~~~~~~~~~~~ | ../../git/libknet/links.c: In function 'knet_link_set_config': | ../../git/libknet/links.c:108:27: note: 'link' was declared here | 108 | struct knet_link *link; | | ^~~~ | cc1: all warnings being treated as errors
Signed-off-by: Mingli Yu <mingli.yu@windriver.com>