StagefrightTest: call codec.stop() before codec.release()

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

Bug: 65483665
Bug: 160346309
Fix: 194287163
Test: atest \
 android.security.cts.StagefrightTest#testStagefright_bug_65483665

Change-Id: I6571c2be5a48bc1e631110cc09560655576059bf
(cherry picked from commit 81e2ae63b96c31c0c7e8f2fdace956cf0f3572ed)
(cherry picked from commit 6c1316019d9a34ce6492292ec4b9c9c6c10f6884)
1 file changed