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Fix illegal memory access when stream starts w/ invisible frame.

Add a check to make sure we have a decoded frame available
before copying its 'corrupt' flag.

(Originally submitted to the old repository by Alexander Voronov
as: https://gerrit.chromium.org/gerrit/#/c/74305/).

Change-Id: Iceb4686c785afb437b668015bf8818b18d60e0ce

--- a/vp9/vp9_dx_iface.c

+++ b/vp9/vp9_dx_iface.c

@@ -937,7 +937,8 @@

           frame_worker_data->pbi->common.buffer_pool->frame_bufs;

       if (frame_worker_data->pbi->common.frame_to_show == NULL)

         return VPX_CODEC_ERROR;

-      *corrupted = frame_bufs[ctx->last_show_frame].buf.corrupted;

+      if (ctx->last_show_frame >= 0)

+        *corrupted = frame_bufs[ctx->last_show_frame].buf.corrupted;

       return VPX_CODEC_OK;

     } else {

       return VPX_CODEC_ERROR;