drm/msm/dsi: Fix potential NULL pointer dereference in msm_dsi_modeset_init
_dev_ is being dereferenced before it is null checked, hence there
is a potential null pointer dereference.
Fix this by moving the pointer dereference after _dev_ has been
null checked.
Fixes: d4e7f38d70ef ("drm/msm/dsi: check msm_dsi and dsi pointers before use") Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com> Signed-off-by: Rob Clark <robdclark@gmail.com>
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