drm/msm/dp: fix error checks in hotplug module
Fix the error checks and return values in the hotplug module so
that the upper layers can correctly handle failures from the
module.
Change-Id: I0646dcb55515fb163f3dba1c4de60c75818ce392
Signed-off-by:
Tatenda Chipeperekwa <tatendac@codeaurora.org>
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