drm/fb_cma_helper: Increase ref count when exporting dma-buf

The fbdev helper that exports a dma-buf to user space didn't correctly
increase the reference count of the DRM driver. Increase the reference
count if exporting was successful.

Change-Id: Id0239e10b7cd46b146dd596f78ee4690910ea747
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
1 file changed