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Minor optimization in mv entropy adaptation

Adds a check to exit from the increment_nmv_count function when the
increment is 0.

Change-Id: I99c1e342d351f7800e23590f9c2419881bf1d708

--- a/vp9/common/vp9_entropymv.c

+++ b/vp9/common/vp9_entropymv.c

@@ -138,6 +138,7 @@

                                     int incr,

                                     int usehp) {

   int s, z, c, o, d, e, f;

+  if (!incr) return;

   assert (v != 0);            /* should not be zero */

   s = v < 0;

   mvcomp->sign[s] += incr;

-- 

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