MidiManager: fix output port close
MidiManager: fix output port close

Clear array entry when MidiOutputPort closed and EndOfStream
is detected.

Change-Id: I47e38ac3a46039d950c66381eac55e2dd10bf9fb
Signed-off-by: Phil Burk <c76ad1a5417d5e5ec6068289c7ca2032944e4216@google.com>

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base