Fix NullpointerException in MediaMetadataRetriever

According to the API documentation and the ICS implementation
the setDataSource(String) method throws an
IllegalArgumentException if path is null. In JB a
NullpointerException is thrown instead. This fix restores
the earlier behaviour.

Change-Id: Ic47baadf91076acc227d92d84f6b8d1d6ecd0c03
Remove unnecessary reference in PackageManagerService

Change-Id: I55f40b8ded69e10bb940a7c84117c5ff1b988d8e
Signed-off-by: You Kim <you.kim72@gmail.com>
Fix leak in videoEditor_renderMediaItemPreviewFrame

This change makes sure that the pString is released
even if any of the error paths are taken later.

Change-Id: I533f8254cb853767a21571cddb1c130f8efde2b4