Fix a tsan error bug in frame parallel decode.
A frame may be waiting for an out of border pixel from another frame. A frame's row progress variable is set to -1 when start being decoded and another frame may be waiting for -2 row pixel from this frame. In this case, vp9_frameworker_wait will return directly and skip the waiting which leads to tsan error between threads. Change-Id: Id16604915fb598b823e34393f696e3aa46fb6422
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