drm/msm/sde: add null checks for pingpong and encoder hardware
Add checks for null pingpong and control hardware blocks through
the encoder and pingpong hardware files of the sde driver.
Change-Id: Iad7727d318c2fe0307e2fb68fe74c721fa1b152f
Signed-off-by: Lloyd Atkinson <latkinso@codeaurora.org>
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