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Don't reset mb clamping state during splitmv decoding

The MV decoding changes in c5fb0eb introduced a bug where the
macroblock clamping state was reset for each partition, so if an
earlier partition needed clamping but a subsequent one didn't,
the MB wouldn't receive clamping. Instead, the state is only
set during splitmv decoding, never cleared.

Change-Id: I224fe258493405ee0f6a04596acdb622c475e845

--- a/vp8/decoder/decodemv.c

+++ b/vp8/decoder/decodemv.c

@@ -394,7 +394,7 @@

                     break;

                 }

-                mbmi->need_to_clamp_mvs = (mv->col < mb_to_left_edge) ? 1 : 0;

+                mbmi->need_to_clamp_mvs |= (mv->col < mb_to_left_edge) ? 1 : 0;

                 mbmi->need_to_clamp_mvs |= (mv->col > mb_to_right_edge) ? 1 : 0;

                 mbmi->need_to_clamp_mvs |= (mv->row < mb_to_top_edge) ? 1 : 0;

                 mbmi->need_to_clamp_mvs |= (mv->row > mb_to_bottom_edge) ? 1 : 0;

-- 

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