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Reset the cyclic_refresh_mode_index to 0 on resize.

On an internal spatial resize, this mode index was not reset to 0,
and therefore could exceed dimensions of seg_map or cyclic_refresh_map.

Change-Id: I6fe85dbd2765eb0207a9d9f71fda8d8b8c34f075

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

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

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

         /* Cycle through the macro_block rows */

         /* MB loop to set local segmentation map */

         i = cpi->cyclic_refresh_mode_index;

+        assert(i < mbs_in_frame);

         do

         {

           /* If the MB is as a candidate for clean up then mark it for

@@ -3915,6 +3916,7 @@

               Q = vp8_regulate_q(cpi, cpi->this_frame_target);

               if (cpi->cyclic_refresh_mode_enabled)

               {

+                cpi->cyclic_refresh_mode_index = 0;

                 if (cpi->current_layer==0)

                   cyclic_background_refresh(cpi, Q, 0);

                 else