util: sudo_uid_lookup should always return error if out isn't set

src/util/fs_path.c

@@ -1938,12 +1938,13 @@ static int sudo_uid_lookup(uid_t *out)
 {
 	git_str uid_str = GIT_STR_INIT;
 	int64_t uid;
-	int error;
+	int error = -1;
 
-	if ((error = git__getenv(&uid_str, "SUDO_UID")) == 0 &&
-	    (error = git__strntol64(&uid, uid_str.ptr, uid_str.size, NULL, 10)) == 0 &&
-	    uid == (int64_t)((uid_t)uid)) {
+	if (git__getenv(&uid_str, "SUDO_UID") == 0 &&
+		git__strntol64(&uid, uid_str.ptr, uid_str.size, NULL, 10) == 0 &&
+		uid == (int64_t)((uid_t)uid)) {
 		*out = (uid_t)uid;
+		error = 0;
 	}
 
 	git_str_dispose(&uid_str);