Fix "Use after free" (CID 248)

src/control/media_discoverer.c

@@ -178,9 +178,9 @@ libvlc_media_discoverer_new_from_name( libvlc_instance_t * p_inst,
 
     if( !p_mdis->p_sd )
     {
-        free( p_mdis );
         libvlc_media_list_release( p_mdis->p_mlist );
         libvlc_exception_raise( p_e, "Can't find the services_discovery module named '%s'", psz_name );
+        free( p_mdis );
         return NULL;
     }
 
@@ -205,9 +205,9 @@ libvlc_media_discoverer_new_from_name( libvlc_instance_t * p_inst,
     bool ret = services_discovery_Start( p_mdis->p_sd );
     if(!ret)
     {
-        free( p_mdis );
         libvlc_media_list_release( p_mdis->p_mlist );
         libvlc_exception_raise( p_e, "Can't start the services_discovery module named '%s'", psz_name );
+        free( p_mdis );
         return NULL;
     }