StagefrightMediaScanner: Close metadata retriever after we are done scanning

This prevents the mediaserver from leaking a file descriptor after
the media scanner runs

BUG: 3373546

Change-Id: I82a8bae82306de3da56a5c7da5b03ecf106a4efc
Signed-off-by: Mike Lockwood <lockwood@android.com>
2 files changed