V4L/DVB (13416): smssdio: initialize return value

The return value may be used uninitialized when the size parameter
happens to be 0.
Signed-off-by: Márton Németh <nm127@freemail.hu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/siano/smssdio.c

@@ -78,7 +78,7 @@ struct smssdio_device {
 
 static int smssdio_sendrequest(void *context, void *buffer, size_t size)
 {
-	int ret;
+	int ret = 0;
 	struct smssdio_device *smsdev;
 
 	smsdev = context;