arc: Handle invalid dummy FD in ProtectedBufferManager This CL makes ProtectedBufferManager::ImportDummyFd() handle an invalid |dummy_fd| and ensures that all the call sites of that method handle a nullptr return value. Bug: b:195769334 Test: None Change-Id: Ie487e8c6018c61d87c3cdd742713d25a5769674d Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3397512 Reviewed-by: Chih-Yu Huang <akahuang@chromium.org> Commit-Queue: Andres Calderon Jaramillo <andrescj@chromium.org> Cr-Commit-Position: refs/heads/main@{#961207}
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