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vp9_loop_filter_frame_mt: defer allocations

the code currently checks whether the allocation has been done instead
of allocating on the first frame.
since:
4f27202 vp9: fix crash in mt loopfilter w/corrupt file

this change defers the allocation until the loop filter is used.

Change-Id: I660c1b7f34e713a8dd9884483f01d23b9847366e

--- a/vp9/decoder/vp9_dthread.c

+++ b/vp9/decoder/vp9_dthread.c

@@ -145,14 +145,12 @@

   const int num_workers = MIN(pbi->max_threads & ~1, tile_cols);

   int i;

-  // Allocate memory used in thread synchronization.

-  // This always needs to be done even if frame_filter_level is 0.

+  if (!frame_filter_level) return;

+

   if (!lf_sync->sync_range || cm->last_height != cm->height) {

     vp9_loop_filter_dealloc(lf_sync);

     vp9_loop_filter_alloc(lf_sync, cm, sb_rows, cm->width);

   }

-

-  if (!frame_filter_level) return;

   vp9_loop_filter_frame_init(cm, frame_filter_level);