drm: Free the writeback_job when it with an empty fb
Adds the check if the writeback_job with an empty fb, then it should be freed in atomic_check phase. With this change, the driver users will not check empty fb case any more. So refined accordingly. Signed-off-by:Lowry Li (Arm Technology China) <lowry.li@arm.com> Reviewed-by:
Liviu Dudau <liviu.dudau@arm.com> Reviewed-by:
James Qian Wang (Arm Technology China) <james.qian.wang@arm.com> Signed-off-by:
james qian wang (Arm Technology China) <james.qian.wang@arm.com> Link: https://patchwork.freedesktop.org/patch/msgid/1564571048-15029-2-git-send-email-lowry.li@arm.com
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