audioflinger: fix reuse of audio HAL patch handle

Fix bug in PatchPanel::createAudioPatch() were the previous
audio HAL assigned patch handle was dropped when modifying an exiting
audio patch

Bug: 137300168
Test: manual test with USB headset insertion removal
Change-Id: Ie8345ca97502a2d7327535f0228e0ff0bc95f8e9
1 file changed