[Android] Remove useless nullity checks

[Geoffrey Métais]

vlc-android | branch: master | Geoffrey Métais <geoffrey.metais at gmail.com> | Fri Nov  2 14:24:13 2018 +0100| [40dffa5c986fe9b14e19f93bc80f3dfbb858777c] | committer: Geoffrey Métais

Remove useless nullity checks

> https://code.videolan.org/videolan/vlc-android/commit/40dffa5c986fe9b14e19f93bc80f3dfbb858777c
---

 .../src/org/videolan/medialibrary/media/Album.java   |  8 ++++----
 .../src/org/videolan/medialibrary/media/Artist.java  | 16 ++++++++--------
 .../src/org/videolan/medialibrary/media/Genre.java   | 18 +++++++++---------
 .../org/videolan/medialibrary/media/Playlist.java    | 20 ++++++++++----------
 4 files changed, 31 insertions(+), 31 deletions(-)

Diff:   https://code.videolan.org/videolan/vlc-android/commit/40dffa5c986fe9b14e19f93bc80f3dfbb858777c