Fix bad deallocation in JackMidiAsyncQueue.

The code is only run when other allocations fail, fix it anyway.
This was found by llvm scan-build.

common/JackMidiAsyncQueue.cpp

@@ -38,7 +38,7 @@ JackMidiAsyncQueue::JackMidiAsyncQueue(size_t max_bytes, size_t max_messages)
         }
         jack_ringbuffer_free(byte_ring);
     }
-    delete data_buffer;
+    delete[] data_buffer;
     throw std::bad_alloc();
 }