aaudio: do not assert if deleting an unopened stream

Bug: 63440754
Test: write_sine.cpp, see bug for repro case
Change-Id: I1f7ed1bd97d4cfcd54d27d41d708c6c03d3d88ac
diff --git a/services/oboeservice/AAudioServiceStreamMMAP.cpp b/services/oboeservice/AAudioServiceStreamMMAP.cpp
index da18f44..1b80486 100644
--- a/services/oboeservice/AAudioServiceStreamMMAP.cpp
+++ b/services/oboeservice/AAudioServiceStreamMMAP.cpp
@@ -215,6 +215,7 @@
     configurationOutput.setAudioFormat(mAudioFormat);
     configurationOutput.setDeviceId(deviceId);
 
+    setState(AAUDIO_STREAM_STATE_OPEN);
     return AAUDIO_OK;
 }