base

Crash in SurfaceTextureTarget filter open

If the filter graph in an app closes out, the SurfaceTextureTarget
filter was losing the reference to the original surfacetexture, and the
app would re-start the graph without setting the surfacetexture again,
thus leading to a crash in registering a surface from surfacetexture.

Typical scenarios is start/stop immediately in camera effects recording.

Fix part of b/6651352
Fix part of b/6655597

Change-Id: Ib2bae7e886784e91b3a886f7ccd439ff190feb22