codec: faad: fail if no extradata

both packetizer and codec requiring extra

modules/codec/faad.c

@@ -130,6 +130,12 @@ static int Open( vlc_object_t *p_this )
         return VLC_EGENERIC;
     }
 
+    if ( !p_dec->fmt_in.i_extra )
+    {
+        msg_Err( p_dec, "cannot initialize faad wihtout codec extradata" );
+        return VLC_EGENERIC;
+    }
+
     /* Allocate the memory needed to store the decoder's structure */
     if( ( p_dec->p_sys = p_sys = malloc( sizeof(*p_sys) ) ) == NULL )
         return VLC_ENOMEM;