drm/msm/dsi-staging: add null check for user length
Add null check to user length while doing read from check esd trigger debugfs node. Change-Id: I075776431f8b50ed0cc3b4bc7652123ea2e2d1d3 Signed-off-by:Shashank Babu Chinta Venkata <sbchin@codeaurora.org> Signed-off-by:
Chirag Khurana <ckhurana@codeaurora.org>
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