[media] em28xx: unregister i2c bus 0 if bus 1 fails to register

Fix the error handling logic, making it to unregister i2c bus 0, in
case of a failure to register the second bus.
Reported-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

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

@@ -2989,6 +2989,9 @@ static int em28xx_init_dev(struct em28xx *dev, struct usb_device *udev,
 		if (retval < 0) {
 			em28xx_errdev("%s: em28xx_i2c_register bus 1 - error [%d]!\n",
 				__func__, retval);
+
+			em28xx_i2c_unregister(dev, 0);
+
 			return retval;
 		}
 	}