s390: Use pr_warn instead of pr_warning

Convert the uses of pr_warning to pr_warn so there are fewer
uses of the old pr_warning.

Miscellanea:

o Align arguments
o Coalesce formats

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/net/qeth_l3_main.c

@@ -3624,7 +3624,7 @@ static int qeth_l3_register_notifiers(void)
 		return rc;
 	}
 #else
-	pr_warning("There is no IPv6 support for the layer 3 discipline\n");
+	pr_warn("There is no IPv6 support for the layer 3 discipline\n");
 #endif
 	return 0;
 }