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>

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;
 }

drivers/tty/tty_io.c

@@ -2843,7 +2843,7 @@ static void tty_warn_deprecated_flags(struct serial_struct __user *ss)
 	flags &= ASYNC_DEPRECATED;
 
 	if (flags && __ratelimit(&depr_flags))
-		pr_warning("%s: '%s' is using deprecated serial flags (with no effect): %.8x\n",
+		pr_warn("%s: '%s' is using deprecated serial flags (with no effect): %.8x\n",
 			__func__, get_task_comm(comm, current), flags);
 }