iommu: io-pgtable: use size_t for unmap return value
Unmap returns a size_t all throughout the IOMMU framework. Make
io-pgtable match this convention.
Change-Id: Ice4c75a428f0f95a665e2fbe4210349d6f78c220
Signed-off-by:
Mitchel Humpherys <mitchelh@codeaurora.org>
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