modules/mux/mpeg/ts.c: Fix adaptation field length without splicing point.

The adaptation field size was not correct in the case that there was no splicing point. This
resulted in corrupt TS packets.

modules/mux/mpeg/ts.c

@@ -2091,7 +2091,9 @@ static block_t *TSNew( sout_mux_t *p_mux, ts_stream_t *p_stream,
             int i_stuffing = i_payload_max - i_payload;
             int i_stuffing_start = b_splicing_point ? 7 : 6;
 
-            p_ts->p_buffer[4] = i_stuffing + (b_splicing_point ? 2 : 1);
+            p_ts->p_buffer[4] = i_stuffing + (b_splicing_point ? 2 : -1);
+            if( i_stuffing > 1 )
+            {
                 p_ts->p_buffer[5] = 0x00;
                 if( b_splicing_point )
                 {
@@ -2109,6 +2111,7 @@ static block_t *TSNew( sout_mux_t *p_mux, ts_stream_t *p_stream,
                 }
             }
         }
+    }
 
     /* copy payload */
     memcpy( &p_ts->p_buffer[188 - i_payload],