msm: kgsl: Fix checking of remote iommu spin lock initialization
If remote spin lock is not configured to be used then the
initialization function will return a NULL value. Check this
value before using it.
Change-Id: Iacb4b7914a93e7aefcd20341ecedbaa466c98acb
Signed-off-by:
Shubhraprakash Das <sadas@codeaurora.org>
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