V4L/DVB (6564): Move check before lock

Signed-off-by: Roel Kluin <12o3l@tiscali.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
CC: Antti Palosaari <crope@iki.fi>
CC: Carl Lundqvist <comabug@gmail.com>
CC: Aapo Tahkola <aet@rasterburn.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/dvb/dvb-usb/au6610.c

@@ -79,12 +79,12 @@ static int au6610_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[],
 	struct dvb_usb_device *d = i2c_get_adapdata(adap);
 	int i;
 
-	if (mutex_lock_interruptible(&d->i2c_mutex) < 0)
-		return -EAGAIN;
-
 	if (num > 2)
 		return -EINVAL;
 
+	if (mutex_lock_interruptible(&d->i2c_mutex) < 0)
+		return -EAGAIN;
+
 	for (i = 0; i < num; i++) {
 		/* write/read request */
 		if (i+1 < num && (msg[i+1].flags & I2C_M_RD)) {

drivers/media/dvb/dvb-usb/gl861.c

@@ -56,12 +56,12 @@ static int gl861_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msg[],
 	struct dvb_usb_device *d = i2c_get_adapdata(adap);
 	int i;
 
-	if (mutex_lock_interruptible(&d->i2c_mutex) < 0)
-		return -EAGAIN;
-
 	if (num > 2)
 		return -EINVAL;
 
+	if (mutex_lock_interruptible(&d->i2c_mutex) < 0)
+		return -EAGAIN;
+
 	for (i = 0; i < num; i++) {
 		/* write/read request */
 		if (i+1 < num && (msg[i+1].flags & I2C_M_RD)) {