gpu: ion: add pointer null checks in map and unmap
Clients may pass incorrect arguments to ION causing crashes. Add checks to validate input for ION APIs. Change-Id: Idafa4535b3ef71184ca11fb2c0c4ab073a52ac2f Signed-off-by:Huaibin Yang <huaibiny@codeaurora.org> Signed-off-by:
Olav Haugan <ohaugan@codeaurora.org>
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