Revert "Fix memleak (should fix #1081)"

This reverts commit 4774dc6c.
(cherry picked from commit 0caa385c)
Signed-off-by: Christophe Mutricy <xtophe@videolan.org>

modules/demux/mpeg/mpga.c

@@ -331,7 +331,6 @@ static void Close( vlc_object_t * p_this )
 
     DESTROY_PACKETIZER( p_sys->p_packetizer );
     if( p_sys->p_block_out ) block_Release( p_sys->p_block_out );
-    if( p_sys->p_block_in ) block_Release( p_sys->p_block_in );
 
     free( p_sys );
 }