[media] v4l: rcar-fcp: Keep the coding style consistent

The Renesas multimedia drivers use ret to store return values, fix the
only exception in the rcar-fcp driver to keep the coding style
consistent.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/rcar-fcp.c

@@ -99,14 +99,14 @@ EXPORT_SYMBOL_GPL(rcar_fcp_put);
  */
 int rcar_fcp_enable(struct rcar_fcp_device *fcp)
 {
-	int error;
+	int ret;
 
 	if (!fcp)
 		return 0;
 
-	error = pm_runtime_get_sync(fcp->dev);
-	if (error < 0)
-		return error;
+	ret = pm_runtime_get_sync(fcp->dev);
+	if (ret < 0)
+		return ret;
 
 	return 0;
 }