vp9_postproc: remove redundant CONFIG_* checks

the entire module is wrapped in CONFIG_VP9_POSTPROC which is forcibly
enabled with CONFIG_INTERNAL_STATS

+ a similar change in vp9_alloccommon.c

Change-Id: I374993297a9fba5bef2f0b71f984eba42f0995a3

vp9/common/vp9_alloccommon.c

@@ -126,7 +126,7 @@ int vp9_alloc_ref_frame_buffers(VP9_COMMON *cm, int width, int height) {
 
   init_frame_bufs(cm);
 
-#if CONFIG_INTERNAL_STATS || CONFIG_VP9_POSTPROC
+#if CONFIG_VP9_POSTPROC
   if (vp9_alloc_frame_buffer(&cm->post_proc_buffer, width, height, ss_x, ss_y,
 #if CONFIG_VP9_HIGHBITDEPTH
                              cm->use_highbitdepth,

vp9/common/vp9_postproc.c

@@ -683,7 +683,6 @@ int vp9_post_proc_frame(struct VP9Common *cm,
     }
   }
 
-#if CONFIG_VP9_POSTPROC || CONFIG_INTERNAL_STATS
   if (vp9_realloc_frame_buffer(&cm->post_proc_buffer, cm->width, cm->height,
                                cm->subsampling_x, cm->subsampling_y,
 #if CONFIG_VP9_HIGHBITDEPTH
@@ -692,7 +691,6 @@ int vp9_post_proc_frame(struct VP9Common *cm,
                                VP9_DEC_BORDER_IN_PIXELS, NULL, NULL, NULL) < 0)
     vpx_internal_error(&cm->error, VPX_CODEC_MEM_ERROR,
                        "Failed to allocate post-processing buffer");
-#endif
 
   if ((flags & VP9D_MFQE) && cm->current_video_frame >= 2 &&
       cm->postproc_state.last_frame_valid &&
@@ -749,4 +747,4 @@ int vp9_post_proc_frame(struct VP9Common *cm,
   swap_mi_and_prev_mi(cm);
   return 0;
 }
-#endif
+#endif  // CONFIG_VP9_POSTPROC