staging: bcm2835-camera: Return early on errors

Fix several instances where it is easier to return
early on error conditions than handle it as an else
clause. As requested by Mauro.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Acked-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Acked-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c

@@ -334,7 +334,9 @@ static void buffer_cb(struct vchiq_mmal_instance *instance,
 			vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 		}
 		return;
-	} else if (length == 0) {
+	}
+
+	if (length == 0) {
 		/* stream ended */
 		if (buf) {
 			/* this should only ever happen if the port is
@@ -357,8 +359,16 @@ static void buffer_cb(struct vchiq_mmal_instance *instance,
 			/* signal frame completion */
 			complete(&dev->capture.frame_cmplt);
 		}
-	} else {
-		if (dev->capture.frame_count) {
+		return;
+	}
+
+	if (!dev->capture.frame_count) {
+		/* signal frame completion */
+		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
+		complete(&dev->capture.frame_cmplt);
+		return;
+	}
+
 	if (dev->capture.vc_start_timestamp != -1 && pts) {
 		ktime_t timestamp;
 		s64 runtime_us = pts -
@@ -392,12 +402,6 @@ static void buffer_cb(struct vchiq_mmal_instance *instance,
 			&dev->capture.frame_count,
 			sizeof(dev->capture.frame_count));
 	}
-		} else {
-			/* signal frame completion */
-			vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
-			complete(&dev->capture.frame_cmplt);
-		}
-	}
 }
 
 static int enable_camera(struct bm2835_mmal_dev *dev)
@@ -775,28 +779,28 @@ static int vidioc_overlay(struct file *file, void *f, unsigned int on)
 
 	ret = vchiq_mmal_port_set_format(dev->instance, src);
 	if (ret < 0)
-		goto error;
+		return ret;
 
 	ret = set_overlay_params(dev, dst);
 	if (ret < 0)
-		goto error;
+		return ret;
 
 	if (enable_camera(dev) < 0)
-		goto error;
+		return -EINVAL;
 
 	ret = vchiq_mmal_component_enable(
 			dev->instance,
 			dev->component[MMAL_COMPONENT_PREVIEW]);
 	if (ret < 0)
-		goto error;
+		return ret;
 
 	v4l2_dbg(1, bcm2835_v4l2_debug, &dev->v4l2_dev, "connecting %p to %p\n",
 		 src, dst);
 	ret = vchiq_mmal_port_connect_tunnel(dev->instance, src, dst);
-	if (!ret)
-		ret = vchiq_mmal_port_enable(dev->instance, src, NULL);
-error:
+	if (ret)
 		return ret;
+
+	return vchiq_mmal_port_enable(dev->instance, src, NULL);
 }
 
 static int vidioc_g_fbuf(struct file *file, void *fh,