[media] cx231xx: stop double error reporting

i2c_mux_add_adapter already logs a message on failure.
Reviewed-by: Wolfram Sang <wsa@the-dreams.de>
Reviewed-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Peter Rosin <peda@axentia.se>

drivers/media/usb/cx231xx/cx231xx-i2c.c

@@ -576,17 +576,10 @@ int cx231xx_i2c_mux_create(struct cx231xx *dev)
 
 int cx231xx_i2c_mux_register(struct cx231xx *dev, int mux_no)
 {
-	int rc;
-
-	rc = i2c_mux_add_adapter(dev->muxc,
+	return i2c_mux_add_adapter(dev->muxc,
 				   0,
 				   mux_no /* chan_id */,
 				   0 /* class */);
-	if (rc)
-		dev_warn(dev->dev,
-			 "i2c mux %d register FAILED\n", mux_no);
-
-	return rc;
 }
 
 void cx231xx_i2c_mux_unregister(struct cx231xx *dev)