drm/virtio: Remove redundant return type

virtio_gpu_fence_emit() always returns 0, since it
has no error paths.

Consequently no calls for virtio_gpu_fence_emit()
use the return value, and it can be removed.
Signed-off-by: Robert Foss <robert.foss@collabora.com>
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20190506091034.30289-1-robert.foss@collabora.comSuggested-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

drivers/gpu/drm/virtio/virtgpu_drv.h

@@ -355,7 +355,7 @@ int virtio_gpu_mmap(struct file *filp, struct vm_area_struct *vma);
 bool virtio_fence_signaled(struct dma_fence *f);
 struct virtio_gpu_fence *virtio_gpu_fence_alloc(
 	struct virtio_gpu_device *vgdev);
-int virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev,
+void virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev,
 			  struct virtio_gpu_ctrl_hdr *cmd_hdr,
 			  struct virtio_gpu_fence *fence);
 void virtio_gpu_fence_event_process(struct virtio_gpu_device *vdev,

drivers/gpu/drm/virtio/virtgpu_fence.c

@@ -85,7 +85,7 @@ struct virtio_gpu_fence *virtio_gpu_fence_alloc(struct virtio_gpu_device *vgdev)
 	return fence;
 }
 
-int virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev,
+void virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev,
 			  struct virtio_gpu_ctrl_hdr *cmd_hdr,
 			  struct virtio_gpu_fence *fence)
 {
@@ -102,7 +102,6 @@ int virtio_gpu_fence_emit(struct virtio_gpu_device *vgdev,
 
 	cmd_hdr->flags |= cpu_to_le32(VIRTIO_GPU_FLAG_FENCE);
 	cmd_hdr->fence_id = cpu_to_le64(fence->f.seqno);
-	return 0;
 }
 
 void virtio_gpu_fence_event_process(struct virtio_gpu_device *vgdev,