Fix bug in segment skip.

Wrong max data size (skip has no data) and use of vp9_get_segdata()
when it should be vp9_segfeature_active().

Change-Id: I1eb97d33df6e2a42cc589049f704266fe3639902

vp9/common/vp9_seg_common.c

@@ -13,7 +13,7 @@
 #include "vp9/common/vp9_seg_common.h"
 
 static const int seg_feature_data_signed[SEG_LVL_MAX] = { 1, 1, 0, 0 };
-static const int seg_feature_data_max[SEG_LVL_MAX] = { MAXQ, 63, 15, 15 };
+static const int seg_feature_data_max[SEG_LVL_MAX] = { MAXQ, 63, 15, 0 };
 
 // These functions provide access to new segment level features.
 // Eventually these function may be "optimized out" but for the moment,

vp9/decoder/vp9_detokenize.c

@@ -293,7 +293,7 @@ SKIP_START:
 }
 
 static int get_eob(MACROBLOCKD* const xd, int segment_id, int eob_max) {
-  return vp9_get_segdata(xd, segment_id, SEG_LVL_SKIP) ? 0 : eob_max;
+  return vp9_segfeature_active(xd, segment_id, SEG_LVL_SKIP) ? 0 : eob_max;
 }
 
 struct decode_block_args {