Check size of grantors before indexing into the vec

It's possible that the MQDescriptor was created with no grantors or an
incorrect amount.

Test: atest fmq_test
Bug: 233680266
Change-Id: Iacfc382c7dd1946350e5a1975002a5cd8c8e0679
1 file changed
tree: a6a627176c7de2d71d2c7826d73311c08a20b520
  1. base/
  2. benchmarks/
  3. fuzzer/
  4. include/
  5. tests/
  6. Android.bp
  7. EventFlag.cpp
  8. FmqInternal.cpp
  9. OWNERS
  10. PREUPLOAD.cfg
  11. TEST_MAPPING