hevc: initialize no_rasl_output_flag in hevc_frame_start().

This prevents a race condition in files with multiple slices per frame.

libavcodec/hevcdec.c

@@ -826,8 +826,6 @@ static int hls_slice_header(HEVCContext *s)
     s->HEVClc->tu.cu_qp_offset_cb = 0;
     s->HEVClc->tu.cu_qp_offset_cr = 0;
 
-    s->no_rasl_output_flag = IS_IDR(s) || IS_BLA(s) || (s->nal_unit_type == HEVC_NAL_CRA_NUT && s->last_eos);
-
     return 0;
 }
 
@@ -2677,6 +2675,8 @@ static int hevc_frame_start(HEVCContext *s)
     s->is_decoded        = 0;
     s->first_nal_type    = s->nal_unit_type;
 
+    s->no_rasl_output_flag = IS_IDR(s) || IS_BLA(s) || (s->nal_unit_type == HEVC_NAL_CRA_NUT && s->last_eos);
+
     if (s->ps.pps->tiles_enabled_flag)
         lc->end_of_tiles_x = s->ps.pps->column_width[0] << s->ps.sps->log2_ctb_size;