USB: trivial: missing newline in usb core warning message

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 73de41b..e5d5a26 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -1316,7 +1316,7 @@
 
 	alt = usb_altnum_to_altsetting(iface, alternate);
 	if (!alt) {
-		dev_warn(&dev->dev, "selecting invalid altsetting %d",
+		dev_warn(&dev->dev, "selecting invalid altsetting %d\n",
 			 alternate);
 		return -EINVAL;
 	}