cbs_h265: Fix Time Code SEI syntax

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@googlemail.com>
Signed-off-by: Mark Thompson <sw@jkqxz.net>

libavcodec/cbs_h265_syntax_template.c

@@ -1955,6 +1955,9 @@ static int FUNC(sei_time_code)(CodedBitstreamContext *ctx, RWContext *rw,
     u(2, num_clock_ts, 1, 3);
 
     for (i = 0; i < current->num_clock_ts; i++) {
+        flags(clock_timestamp_flag[i],   1, i);
+
+        if (current->clock_timestamp_flag[i]) {
             flags(units_field_based_flag[i], 1, i);
             us(5, counting_type[i], 0, 6,    1, i);
             flags(full_timestamp_flag[i],    1, i);
@@ -1986,6 +1989,7 @@ static int FUNC(sei_time_code)(CodedBitstreamContext *ctx, RWContext *rw,
                 us(current->time_offset_length[i], time_offset_value[i],
                    0, MAX_UINT_BITS(current->time_offset_length[i]), 1, i);
         }
+    }
 
     return 0;
 }