Fixed unchecked key blob access in attestKey
In attestKey we did not check a return value after retrieving a key blob. This results in a segfault if an attestation is requested on a non existent or corrupted key. Bug: 135907940 Bug: 138146601 Change-Id: I1e84d334bb93ac878b63e15a59c35631f9e6e397 Merged-In: I1e84d334bb93ac878b63e15a59c35631f9e6e397
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