Fix slow sound init in piano sample app
Fix slow sound init in piano sample app

Fixes #1696. Also fixes handles leaking on error.

mikejurka/engine,flutter/engine,rmacnak-google/engine,jason-simmons/sky_engine,devoncarew/sky_engine,mxia/engine,jason-simmons/flutter_engine,jamesr/sky_engine,mpcomplete/engine,krisgiesing/sky_engine,lyceel/engine,jamesr/flutter_engine,jamesr/flutter_engine,mikejurka/engine,lyceel/engine,jamesr/sky_engine,Hixie/sky_engine,devoncarew/engine,jamesr/flutter_engine,flutter/engine,mpcomplete/engine,tvolkert/engine,aam/engine,chinmaygarde/sky_engine,jamesr/flutter_engine,jason-simmons/sky_engine,lyceel/engine,chinmaygarde/sky_engine,jason-simmons/flutter_engine,tvolkert/engine,abarth/sky_engine,cdotstout/sky_engine,aam/engine,lyceel/engine,aam/engine,devoncarew/engine,Hixie/sky_engine,mpcomplete/flutter_engine,rmacnak-google/engine,mikejurka/engine,cdotstout/sky_engine,mpcomplete/flutter_engine,mpcomplete/flutter_engine,rmacnak-google/engine,devoncarew/sky_engine,chinmaygarde/flutter_engine,chinmaygarde/flutter_engine,aam/engine,krisgiesing/sky_engine,jason-simmons/flutter_engine,jason-simmons/sky_engine,jamesr/flutter_engine,mikejurka/engine,Hixie/sky_engine,jamesr/flutter_engine,devoncarew/sky_engine,devoncarew/sky_engine,jamesr/sky_engine,mpcomplete/engine,mxia/engine,aam/engine,cdotstout/sky_engine,aam/engine,flutter/engine,rmacnak-google/engine,mikejurka/engine,cdotstout/sky_engine,flutter/engine,lyceel/engine,jamesr/sky_engine,abarth/sky_engine,jamesr/flutter_engine,mpcomplete/flutter_engine,tvolkert/engine,flutter/engine,aam/engine,mpcomplete/engine,rmacnak-google/engine,mxia/engine,jamesr/flutter_engine,devoncarew/engine,chinmaygarde/sky_engine,chinmaygarde/sky_engine,rmacnak-google/engine,devoncarew/sky_engine,jason-simmons/sky_engine,rmacnak-google/engine,chinmaygarde/sky_engine,mikejurka/engine,krisgiesing/sky_engine,mxia/engine,flutter/engine,chinmaygarde/flutter_engine,mxia/engine,abarth/sky_engine,Hixie/sky_engine,devoncarew/sky_engine,jason-simmons/flutter_engine,lyceel/engine,abarth/sky_engine,tvolkert/engine,devoncarew/engine,Hixie/sky_engine,chinmaygarde/flutter_engine,jamesr/sky_engine,mxia/engine,jamesr/sky_engine,jamesr/sky_engine,lyceel/engine,cdotstout/sky_engine,Hixie/sky_engine,chinmaygarde/flutter_engine,Hixie/sky_engine,mpcomplete/engine,mxia/engine,krisgiesing/sky_engine,aam/engine,flutter/engine,chinmaygarde/flutter_engine,mpcomplete/engine,cdotstout/sky_engine,jason-simmons/flutter_engine,tvolkert/engine,mikejurka/engine,jamesr/flutter_engine,abarth/sky_engine,krisgiesing/sky_engine,mpcomplete/flutter_engine,jason-simmons/sky_engine,mikejurka/engine,flutter/engine,devoncarew/engine,jason-simmons/flutter_engine,mpcomplete/engine,mpcomplete/engine,mikejurka/engine,chinmaygarde/sky_engine,krisgiesing/sky_engine,mpcomplete/flutter_engine,abarth/sky_engine,jason-simmons/flutter_engine,abarth/sky_engine,devoncarew/engine,chinmaygarde/flutter_engine,devoncarew/engine,mxia/engine,cdotstout/sky_engine,tvolkert/engine,jason-simmons/sky_engine,Hixie/sky_engine,devoncarew/sky_engine,chinmaygarde/sky_engine,krisgiesing/sky_engine,jason-simmons/sky_engine,tvolkert/engine,jason-simmons/flutter_engine