media: imx: Don't initialize vars that won't be used

As reported by gcc:

  + drivers/staging/media/imx/imx-media-csi.c: warning: variable 'input_fi' set but not used [-Wunused-but-set-variable]:  => 671:33
  + drivers/staging/media/imx/imx-media-csi.c: warning: variable 'pinctrl' set but not used [-Wunused-but-set-variable]:  => 1742:18

input_fi is not used, so just remove it.

However, pinctrl should be used, as it devm_pinctrl_get_select_default()
is declared with attribute warn_unused_result. What's missing there
is an error handling code, in case it fails. Add it.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/staging/media/imx/imx-media-csi.c

@@ -668,11 +668,10 @@ static int csi_setup(struct csi_priv *priv)
 
 static int csi_start(struct csi_priv *priv)
 {
-	struct v4l2_fract *output_fi, *input_fi;
+	struct v4l2_fract *output_fi;
 	int ret;
 
 	output_fi = &priv->frame_interval[priv->active_output_pad];
-	input_fi = &priv->frame_interval[CSI_SINK_PAD];
 
 	if (priv->dest == IPU_CSI_DEST_IDMAC) {
 		ret = csi_idmac_start(priv);
@@ -1797,6 +1796,10 @@ static int imx_csi_probe(struct platform_device *pdev)
 	 */
 	priv->dev->of_node = pdata->of_node;
 	pinctrl = devm_pinctrl_get_select_default(priv->dev);
+	if (IS_ERR(pinctrl)) {
+		ret = PTR_ERR(priv->vdev);
+		goto free;
+	}
 
 	ret = v4l2_async_register_subdev(&priv->sd);
 	if (ret)