[media] Fix the negative -E{BLAH} returns from fops_read

Signed-off-by: Gavin Hurlbut <gjhurlbu@gmail.com>
Signed-off-by: Steven Toth <stoth@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/saa7164/saa7164-encoder.c

@@ -1165,7 +1165,7 @@ static ssize_t fops_read(struct file *file, char __user *buffer,
 	struct saa7164_port *port = fh->port;
 	struct saa7164_user_buffer *ubuf = NULL;
 	struct saa7164_dev *dev = port->dev;
-	unsigned int ret = 0;
+	int ret = 0;
 	int rem, cnt;
 	u8 *p;