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Fix use of uninitialized memory in CONFIG_ABOVESPREFMV

The ABOVESPREFMV experiment uses four pixels to the left of the
current block, which don't exist for the left-most column.

Change-Id: I4cf0b42ae8f54c0b3e7b1ed8755704b74fafc39c

--- a/vp9/common/vp9_findnearmv.c

+++ b/vp9/common/vp9_findnearmv.c

@@ -190,7 +190,11 @@

       col_offset = this_mv.as_mv.col >> 3;

       offset = ref_y_stride * row_offset + col_offset;

       score = 0;

+#if !CONFIG_ABOVESPREFMV

       if (xd->up_available) {

+#else

+      if (xd->up_available && xd->left_available) {

+#endif

         vp9_sub_pixel_variance16x2(above_ref + offset, ref_y_stride,

                                    SP(this_mv.as_mv.col),

                                    SP(this_mv.as_mv.row),