[media] em28xx: Fix: I2C_CLK write error message checks wrong return code

It looks like the return value check that is done after setting the I2C
speed checks the wrong return code.
Signed-off-by: Sascha Sommer <saschasommer@freenet.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/em28xx/em28xx-cards.c

@@ -3014,7 +3014,7 @@ static int em28xx_init_dev(struct em28xx *dev, struct usb_device *udev,
 
 	if (!dev->board.is_em2800) {
 		/* Resets I2C speed */
-		em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, dev->board.i2c_speed);
+		retval = em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, dev->board.i2c_speed);
 		if (retval < 0) {
 			em28xx_errdev("%s: em28xx_write_reg failed!"
 				      " retval [%d]\n",