libbpf: Fix str_has_sfx()'s return value

The return from strcmp() is inverted so it wrongly returns true instead
of false and vice versa.

Fixes: a1c9d61 ("libbpf: Improve library identification for uprobe binary path resolution")
Signed-off-by: Dan Carpenter <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Acked-by: Martin KaFai Lau <[email protected]>
Cc: Alan Maguire <[email protected]>
Link: https://lore.kernel.org/bpf/YtZ+/dAA195d99ak@kili

Author: Dan Carpenter

tools/lib/bpf/libbpf_internal.h

@@ -108,9 +108,9 @@ static inline bool str_has_sfx(const char *str, const char *sfx)
 	size_t str_len = strlen(str);
 	size_t sfx_len = strlen(sfx);
 
-	if (sfx_len <= str_len)
-		return strcmp(str + str_len - sfx_len, sfx);
-	return false;
+	if (sfx_len > str_len)
+		return false;
+	return strcmp(str + str_len - sfx_len, sfx) == 0;
 }
 
 /* Symbol versioning is different between static and shared library.