MidiService: fix resource leak

The proxy object was being used to match when adding or removing objects.
But they are different each time. So now we use an asBinder() object.

Bug: 28153736
Change-Id: I1bccebf1e9464668db757ff08b41902d0cf0e3a7
Signed-off-by: Phil Burk <philburk@google.com>
1 file changed