araw: use VLC_TS_INVALID (refs #3135)

modules/codec/araw.c

@@ -336,7 +336,7 @@ static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
 
     p_block = *pp_block;
 
-    if( p_block->i_pts != 0 &&
+    if( p_block->i_pts > VLC_TS_INVALID &&
         p_block->i_pts != date_Get( &p_sys->end_date ) )
     {
         date_Set( &p_sys->end_date, p_block->i_pts );
@@ -349,7 +349,7 @@ static aout_buffer_t *DecodeBlock( decoder_t *p_dec, block_t **pp_block )
     }
 
     /* Don't re-use the same pts twice */
-    p_block->i_pts = 0;
+    p_block->i_pts = VLC_TS_INVALID;
 
     i_samples = p_block->i_buffer / p_sys->i_bytespersample /
         p_dec->fmt_in.audio.i_channels;