Fix findId spinning if session id is not found. *** DO NOT MERGE ***

This fix is already in master.

If session id is not found, the iterator is not incremented
such that the end() condition is reached.

The Test:
How is this bug discovered:
Calling AMediaDrm_closeSession() after AMediaDrm_provideKeyResponse()
results in spinning.

This cl is tested on nyc-mr2-dev branch using a NativeClearKeySystemTest.
After the test is run, the previous screen will be restored.

Test: ANDROID_BUILD_TOP= ./android-cts/tools/cts-tradefed run cts -m CtsMediaTestCases --test android.media.cts.NativeClearKeySystemTest#testClearKeyPlaybackCenc

bug: 32235473
Change-Id: I2bbbd8a4e92a4c926eff538a67d9719c1b6ec7d0