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vp9_mv_pred: quiet a static analysis warning

add an assert to validate pred_mv array size

Change-Id: I532b882b71e2baff3ac76e07ed133ec5a11bd0fc

--- a/vp9/encoder/vp9_rd.c

+++ b/vp9/encoder/vp9_rd.c

@@ -467,6 +467,7 @@

   pred_mv[0] = mbmi->ref_mvs[ref_frame][0].as_mv;

   pred_mv[1] = mbmi->ref_mvs[ref_frame][1].as_mv;

   pred_mv[2] = x->pred_mv[ref_frame];

+  assert(num_mv_refs <= (int)(sizeof(pred_mv) / sizeof(pred_mv[0])));

   // Get the sad for each candidate reference mv.

   for (i = 0; i < num_mv_refs; ++i) {