audiobargraph: setup filter_t only when successful

modules/audio_filter/audiobargraph_a.c

@@ -130,25 +130,7 @@ struct filter_sys_t
 static int Open( vlc_object_t *p_this )
 {
     filter_t     *p_filter = (filter_t *)p_this;
-    filter_sys_t *p_sys;
-
-    if ( !AOUT_FMTS_SIMILAR( &p_filter->fmt_in.audio, &p_filter->fmt_out.audio ) )
-    {
-        msg_Err( p_filter, "input and output formats are not similar" );
-        return VLC_EGENERIC;
-    }
-
-    if( p_filter->fmt_in.audio.i_format != VLC_CODEC_FL32 ||
-        p_filter->fmt_out.audio.i_format != VLC_CODEC_FL32 )
-    {
-        p_filter->fmt_in.audio.i_format = VLC_CODEC_FL32;
-        p_filter->fmt_out.audio.i_format = VLC_CODEC_FL32;
-        msg_Warn( p_filter, "bad input or output format" );
-    }
-
-    p_filter->pf_audio_filter = DoWork;
-
-    p_sys = p_filter->p_sys = malloc( sizeof( *p_sys ) );
+    filter_sys_t *p_sys = p_filter->p_sys = malloc( sizeof( *p_sys ) );
     if( !p_sys )
         return VLC_ENOMEM;
 
@@ -172,6 +154,10 @@ static int Open( vlc_object_t *p_this )
     p_sys->started = 0;
     p_sys->lastAlarm = 0;
 
+    p_filter->fmt_in.audio.i_format = VLC_CODEC_FL32;
+    p_filter->fmt_out.audio = p_filter->fmt_in.audio;
+    p_filter->pf_audio_filter = DoWork;
+
     return VLC_SUCCESS;
 }