mei: nfc: fix style warning

fix style warning:
void function return statements are not generally useful

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/mei/nfc.c

@@ -472,7 +472,6 @@ err:
 	mei_nfc_free(ndev);
 	mutex_unlock(&dev->device_lock);
 
-	return;
 }