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vp8 onyx_if: assert divide by zero

Clears up static clang analysis warning regarding divide by zero.

Trying to explain to the compiler how it's impossible to avoid
incrementing num_blocks at least once is difficult.

Change-Id: Ibaae43be572e5cd7a689b440dcd341c17d33443b

--- a/vp8/encoder/onyx_if.c

+++ b/vp8/encoder/onyx_if.c

@@ -43,6 +43,7 @@

 #endif

 #include "encodeframe.h"

+#include <assert.h>

 #include <math.h>

 #include <stdio.h>

 #include <limits.h>

@@ -3052,6 +3053,7 @@

   }

   // Only return non-zero if we have at least ~1/16 samples for estimate.

   if (num_blocks > (tot_num_blocks >> 4)) {

+    assert(num_blocks != 0);

     return (Total / num_blocks);

   } else {

     return 0;