[libhandy] avatar: Check the icon is valid before using it

[Alexander Mikhaylenko <alexm src gnome org>]

commit 36b8b469ed0d487390f6ea6f5c8eb705b51a57bd
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Tue Jul 14 22:57:44 2020 +0200

    avatar: Check the icon is valid before using it
    
    This fixes a crash when the icon isn't found.

 src/hdy-avatar.c | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/src/hdy-avatar.c b/src/hdy-avatar.c
index 76fb5ced..31ae8026 100644
--- a/src/hdy-avatar.c
+++ b/src/hdy-avatar.c
@@ -387,6 +387,12 @@ hdy_avatar_draw (GtkWidget *widget,
                                      icon_name,
                                      size / 2, scale,
                                      GTK_ICON_LOOKUP_FORCE_SYMBOLIC);
+  if (icon == NULL) {
+    g_critical ("Failed to load icon `%s'", icon_name);
+
+    return FALSE;
+  }
+
   gtk_style_context_get_color (context, gtk_style_context_get_state (context), &color);
   pixbuf = gtk_icon_info_load_symbolic (icon, &color, NULL, NULL, NULL, NULL, &error);
   if (error != NULL) {