Fix range checks in motion search

There were some situations that the start motion vectors were
out of range. This fix adjusted range checks to make sure they
are checked and clamped.

Change-Id: Ife83b7fed0882bba6d1fa559b6e63c054fd5065d

vp8/encoder/pickinter.c

@@ -669,8 +669,6 @@ void vp8_pick_inter_mode(VP8_COMP *cpi, MACROBLOCK *x, int recon_yoffset,
                 mvp_full.as_mv.col = mvp.as_mv.col>>3;
                 mvp_full.as_mv.row = mvp.as_mv.row>>3;
 
-                /* adjust mvp to make sure it is within MV range */
-                vp8_clamp_mv(&mvp_full, col_min, col_max, row_min, row_max);
             }else
             {
                 mvp.as_int = best_ref_mv.as_int;