src: fix typo in comment

src/audio_output/common.c

@@ -531,7 +531,7 @@ static int FilterOrder( const char *psz_name )
     return INT_MAX;
 }
 
-/* This function will add or remove a a module from a string list (colon
+/* This function will add or remove a module from a string list (colon
  * separated). It will return true if there is a modification
  * In case p_aout is NULL, we will use configuration instead of variable */
 bool aout_ChangeFilterString( vlc_object_t *p_obj, vlc_object_t *p_aout,