Fix kill_pg_info(): return success if _any_ signal succeeded.

kernel/signal.c

@@ -1071,23 +1071,19 @@ int __kill_pg_info(int sig, struct siginfo *info, pid_t pgrp)
 	struct task_struct *p;
 	struct list_head *l;
 	struct pid *pid;
-	int retval;
-	int found;
+	int retval, success;
 
 	if (pgrp <= 0)
 		return -EINVAL;
 
-	found = 0;
-	retval = 0;
+	success = 0;
+	retval = -ESRCH;
 	for_each_task_pid(pgrp, PIDTYPE_PGID, p, l, pid) {
-		int err;
-
-		found = 1;
-		err = group_send_sig_info(sig, info, p);
-		if (!retval)
-			retval = err;
+		int err = group_send_sig_info(sig, info, p);
+		success |= !err;
+		retval = err;
 	}
-	return found ? retval : -ESRCH;
+	return success ? 0 : retval;
 }
 
 int