(trunk qt) plug memory leak

qt/my-valgrind.sh

@@ -2,4 +2,4 @@
 export G_SLICE=always-malloc
 export G_DEBUG=gc-friendly
 export GLIBCXX_FORCE_NEW=1
-valgrind --tool=memcheck --leak-check=full --leak-resolution=high --num-callers=64 --log-file=x-valgrind --show-reachable=yes ./qtr -r http://localhost:9091/
+valgrind --tool=memcheck --leak-check=full --leak-resolution=high --num-callers=64 --log-file=x-valgrind --show-reachable=yes ./qtr 

qt/session.cc

@@ -613,6 +613,7 @@ Session :: onRequestFinished( int id, bool error )
         parseResponse( json, jsonLength );
     }
 
+    delete sourceDevice;
     myBuffer.buffer( ).clear( );
     myBuffer.reset( );
     assert( myBuffer.bytesAvailable( ) < 1 );