Use av1_num_planes(cm) in av1_init_mt_sync()

Use av1_num_planes(cm) instead of MAX_MB_PLANE for the
av1_loop_restoration_alloc() call in av1_init_mt_sync().

Change-Id: I0fb4a17abede20a8e4715bc425bd194ac528d971

av1/encoder/ethread.c

diff --git a/av1/encoder/ethread.c b/av1/encoder/ethread.c
index 0422856..9fad50c 100644
--- a/av1/encoder/ethread.c
+++ b/av1/encoder/ethread.c
@@ -920,12 +920,13 @@
       int rst_unit_size = cpi->sf.lpf_sf.min_lr_unit_size;
       int num_rows_lr = av1_lr_count_units(rst_unit_size, cm->height);
       int num_lr_workers = av1_get_num_mod_workers_for_alloc(p_mt_info, MOD_LR);
+      const int num_planes = av1_num_planes(cm);
       if (!lr_sync->sync_range || num_rows_lr > lr_sync->rows ||
           num_lr_workers > lr_sync->num_workers ||
-          MAX_MB_PLANE > lr_sync->num_planes) {
+          num_planes > lr_sync->num_planes) {
         av1_loop_restoration_dealloc(lr_sync);
         av1_loop_restoration_alloc(lr_sync, cm, num_lr_workers, num_rows_lr,
-                                   MAX_MB_PLANE, cm->width);
+                                   num_planes, cm->width);
       }
     }
 #endif