Play more than one media to improve coverage a bit

(cherry picked from commit c01710dd)

test/libvlc/media_list_player.c

@@ -170,8 +170,11 @@ static void test_media_list_player_play_item_at_index(const char** argv, int arg
 
     mlp = libvlc_media_list_player_new (vlc, &ex);
 
-    libvlc_media_list_add_media( ml, md, &ex );
-    catch ();
+    for (unsigned i = 0; i < 5; i++)
+    {
+        libvlc_media_list_add_media( ml, md, &ex );
+        catch ();
+    }
 
     libvlc_media_list_player_set_media_list( mlp, ml, &ex );