tree bd521e20c20110e557c9c11281cfb1ae172de380
parent 1ad238ab92c815db1ace667926c7d4a6ad43f543
author Mathias Agopian <mathias@google.com> 1312334991 -0700
committer Mathias Agopian <mathias@google.com> 1312334997 -0700

fix a crasher in surfaceflinger

this would happen if being told to draw before a buffer
was available.

Change-Id: I46d121c73e883078cdbf952063e38b0076f79038