psb_CreateSurfaces2: Fix memory leak

Signed-off-by: Sean V Kelley <sean.v.kelley@intel.com>
tng_vp8: Add better checks on frame concealment.

Signed-off-by: Sean V Kelley <sean.v.kelley@intel.com>
psb_video: Remove MPEG4 from EC checks

Not supported.

Signed-off-by: Sean V Kelley <sean.v.kelley@intel.com>
psb_video: Fix potential coherency issue

When two threads attempt to call into the driver, if obj_surface is set as
static for EC, another thread will also use the same obj_surface for EC.
Potentially the other thread could destroy the surface killing the other
thread.

Signed-off-by: Sean V Kelley <sean.v.kelley@intel.com>