Initialize pointer members to NULL to avoid illegal reference

mBitmap and mTexture is not initialized to NULL which causes
illegal address access when it fails to be created from
oversized bitmap.

Change-Id: Iea54bec8788bc5f3a10040fdb43f416c0d41a14c
Merge "Initialize pointer members to NULL to avoid illegal reference" into kitkat
Merge branch 'kitkat' of github.com:AOKP/frameworks_base into kitkat