drivers/tty: Convert remaining uses of pr_warning to pr_warn

To enable eventual removal of pr_warning

This makes pr_warn use consistent for drivers/tty

Prior to this patch, there were 2 uses of pr_warning and
23 uses of pr_warn in drivers/tty

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/hvc/hvcs.c b/drivers/tty/hvc/hvcs.c
index 7823d6d..99bb875 100644
--- a/drivers/tty/hvc/hvcs.c
+++ b/drivers/tty/hvc/hvcs.c
@@ -1575,7 +1575,7 @@ static int __init hvcs_module_init(void)
 	 */
 	rc = driver_create_file(&(hvcs_vio_driver.driver), &driver_attr_rescan);
 	if (rc)
-		pr_warning("HVCS: Failed to create rescan file (err %d)\n", rc);
+		pr_warn("HVCS: Failed to create rescan file (err %d)\n", rc);
 
 	return 0;
 }