libbpf: Ignore hashmap__find() result explicitly in btf_dump

Coverity is reporting that btf_dump_name_dups() doesn't check return
result of hashmap__find() call. This is intentional, so make it explicit
with (void) cast.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20221117192824.4093553-1-andrii@kernel.org

tools/lib/bpf/btf_dump.c

@@ -1543,7 +1543,7 @@ static size_t btf_dump_name_dups(struct btf_dump *d, struct hashmap *name_map,
 	if (!new_name)
 		return 1;
 
-	hashmap__find(name_map, orig_name, &dup_cnt);
+	(void)hashmap__find(name_map, orig_name, &dup_cnt);
 	dup_cnt++;
 
 	err = hashmap__set(name_map, new_name, dup_cnt, &old_name, NULL);