[DO NOT MERGE] StagefrightTest: call codec.stop() before codec.release()

Add missing codec.stop() before calling codec.release() in
doStagefrightTestMediaCodec()

Bug: 65483665
Bug: 160346309
Test: atest \
 android.security.cts.StagefrightTest#testStagefright_bug_65483665

Change-Id: I6571c2be5a48bc1e631110cc09560655576059bf
1 file changed