[Bluetooth] Don't use %d notation for non devfs name field of tty_driver

This patch removes the misplaced %d in the name field of the tty_driver
structure if devfs is not used.

net/bluetooth/rfcomm/tty.c

@@ -854,7 +854,7 @@ static struct tty_driver rfcomm_tty_driver = {
 #ifdef CONFIG_DEVFS_FS
 	.name			= "bluetooth/rfcomm/%d",
 #else
-	.name			= "rfcomm%d",
+	.name			= "rfcomm",
 #endif
 	.major			= RFCOMM_TTY_MAJOR,
 	.minor_start		= RFCOMM_TTY_MINOR,