msm: camera: Null check added at iommu_attach_device
In case domain has not been initialized before, added a null
check for it inorder to avoid a potential kernel panic.
CRs-Fixed: 502383
Change-Id: I43a173e96415bdaea0968ce6ca37e6c1ee75d666
Signed-off-by:
Aditya Jonnalagadda <ajonnala@codeaurora.org>
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