[patch] vmwgfx: return an -EFAULT if copy_to_user() fails

[Dan Carpenter]

copy_to_user() returns the number of bytes remaining to be copied, but
we want to return a negative error code here.  I fixed a couple of these
last year, but I missed this one.

Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>
---
I think there were only three copy_to/from_user() functions in this
file and they're all fixed now.

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c b/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c
index b07ca2e..7290811 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c
@@ -110,6 +110,8 @@ int vmw_get_cap_3d_ioctl(struct drm_device *dev, void *data,
 	memcpy_fromio(bounce, &fifo_mem[SVGA_FIFO_3D_CAPS], size);
 
 	ret = copy_to_user(buffer, bounce, size);
+	if (ret)
+		ret = -EFAULT;
 	vfree(bounce);
 
 	if (unlikely(ret != 0))