[gnome-software] trivial: Add cast to avoid warning

[Robert Ancell <rancell src gnome org>]

commit 8528476153b64078bdabf0bb0de1d3d7c356c3e5
Author: Robert Ancell <robert ancell canonical com>
Date:   Mon Jul 15 11:36:04 2019 +1200

    trivial: Add cast to avoid warning
    
    The cast was missing in commit 5a2293434

 src/gs-search-page.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/gs-search-page.c b/src/gs-search-page.c
index 9d70c49c..c543faef 100644
--- a/src/gs-search-page.c
+++ b/src/gs-search-page.c
@@ -118,7 +118,7 @@ gs_search_page_get_search_cb (GObject *source_object,
        for (i = 0; i < gs_app_list_length (list); i++) {
                app = gs_app_list_index (list, i);
                app_row = gs_app_row_new (app);
-               gs_app_row_set_show_rating (app_row, TRUE);
+               gs_app_row_set_show_rating (GS_APP_ROW (app_row), TRUE);
                g_signal_connect (app_row, "button-clicked",
                                  G_CALLBACK (gs_search_page_app_row_clicked_cb),
                                  self);