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libbpf: Avoid possible use of uninitialized mod_len

Though mod_len is only read when mod_name != NULL and both are initialized
together, gcc15 produces a warning with -Werror=maybe-uninitialized:

libbpf.c: In function 'find_kernel_btf_id.constprop':
libbpf.c:10100:33: error: 'mod_len' may be used uninitialized [-Werror=maybe-uninitialized]
10100 | if (mod_name && strncmp(mod->name, mod_name, mod_len) != 0)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
libbpf.c:10070:21: note: 'mod_len' was declared here
10070 | int ret, i, mod_len;
| ^~~~~~~

Silence the false positive.

Signed-off-by: Achill Gilgenast <fossdd@pwned.life>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20250729094611.2065713-1-fossdd@pwned.life
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

authored by

Achill Gilgenast and committed by
Alexei Starovoitov 13cb7573 abad3d0b

+1 -1
+1 -1
tools/lib/bpf/libbpf.c
··· 10096 10096 enum bpf_attach_type attach_type, 10097 10097 int *btf_obj_fd, int *btf_type_id) 10098 10098 { 10099 - int ret, i, mod_len; 10099 + int ret, i, mod_len = 0; 10100 10100 const char *fn_name, *mod_name = NULL; 10101 10101 10102 10102 fn_name = strchr(attach_name, ':');