vp9: make postproc members depend on CONFIG_VP9_POSTPROC

Change-Id: Id64218386968cee3132269e4a0572650f20fd980

vp9/common/vp9_alloccommon.c

@@ -44,8 +44,10 @@ void vp9_free_ref_frame_buffers(VP9_COMMON *cm) {
     vp9_free_frame_buffer(&cm->frame_bufs[i].buf);
   }
 
+#if CONFIG_VP9_POSTPROC
   vp9_free_frame_buffer(&cm->post_proc_buffer);
   vp9_free_frame_buffer(&cm->post_proc_buffer_int);
+#endif
 }
 
 void vp9_free_context_buffers(VP9_COMMON *cm) {

vp9/common/vp9_onyxc_int.h

@@ -112,8 +112,10 @@ typedef struct VP9Common {
 
   int new_fb_idx;
 
+#if CONFIG_VP9_POSTPROC
   YV12_BUFFER_CONFIG post_proc_buffer;
   YV12_BUFFER_CONFIG post_proc_buffer_int;
+#endif
 
   FRAME_TYPE last_frame_type;  /* last frame's frame type for motion search.*/
   FRAME_TYPE frame_type;