media: rkisp1: Use %pe format specifier

The %pe format specifier is designed to print error pointers. It prints
a symbolic error name (eg. -EINVAL) and it makes the code simpler by
omitting PTR_ERR().

This patch fixes this cocci report:
./platform/rockchip/rkisp1/rkisp1-isp.c:940:3-10: WARNING: Consider using %pe to print PTR_ERR()
./platform/rockchip/rkisp1/rkisp1-csi.c:372:3-10: WARNING: Consider using %pe to print PTR_ERR()

Signed-off-by: Ricardo Ribalda <[e-mail]>
Acked-by: Sakari Ailus <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

drivers/media/platform/rockchip/rkisp1/rkisp1-csi.c

···
 
 	source_pad = media_entity_remote_source_pad_unique(&sd->entity);
 	if (IS_ERR(source_pad)) {
-		dev_dbg(rkisp1->dev, "Failed to get source for CSI: %ld\n",
-			PTR_ERR(source_pad));
+		dev_dbg(rkisp1->dev, "Failed to get source for CSI: %pe\n",
+			source_pad);
 		return -EPIPE;
 	}
 

drivers/media/platform/rockchip/rkisp1/rkisp1-isp.c

···
 	sink_pad = &isp->pads[RKISP1_ISP_PAD_SINK_VIDEO];
 	source_pad = media_pad_remote_pad_unique(sink_pad);
 	if (IS_ERR(source_pad)) {
-		dev_dbg(rkisp1->dev, "Failed to get source for ISP: %ld\n",
-			PTR_ERR(source_pad));
+		dev_dbg(rkisp1->dev, "Failed to get source for ISP: %pe\n",
+			source_pad);
 		return -EPIPE;
 	}