libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_encodeframe.c

Index: source/libvpx/vp9/encoder/vp9_encodeframe.c
===================================================================
--- source/libvpx/vp9/encoder/vp9_encodeframe.c	(revision 285372)
+++ source/libvpx/vp9/encoder/vp9_encodeframe.c	(working copy)
@@ -260,6 +260,8 @@
 
 static void tree_to_node(void *data, BLOCK_SIZE bsize, variance_node *node) {
   int i;
+  node->part_variances = NULL;
+  vpx_memset(node->split, 0, sizeof(node->split));
   switch (bsize) {
     case BLOCK_64X64: {
       v64x64 *vt = (v64x64 *) data;
@@ -638,10 +640,8 @@
 
 void vp9_setup_src_planes(MACROBLOCK *x, const YV12_BUFFER_CONFIG *src,
                           int mi_row, int mi_col) {
-  uint8_t *const buffers[4] = {src->y_buffer, src->u_buffer, src->v_buffer,
-                               src->alpha_buffer};
-  const int strides[4] = {src->y_stride, src->uv_stride, src->uv_stride,
-                          src->alpha_stride};
+  uint8_t *const buffers[3] = {src->y_buffer, src->u_buffer, src->v_buffer };
+  const int strides[3] = {src->y_stride, src->uv_stride, src->uv_stride };
   int i;
 
   // Set current frame pointer.
@@ -2362,9 +2362,9 @@
   else if (cpi->rc.is_src_frame_alt_ref && cpi->refresh_golden_frame)
     return ALTREF_FRAME;
   else if (cpi->refresh_golden_frame || cpi->refresh_alt_ref_frame)
+    return GOLDEN_FRAME;
+  else
     return LAST_FRAME;
-  else
-    return GOLDEN_FRAME;
 }
 
 static TX_MODE select_tx_mode(const VP9_COMP *cpi) {