[geary/wip/712902-empty-gmail-folder] Fix build with new FolderPath API

[Michael Gratton <mjog src gnome org>]

commit 23ea1589cd46ace11906a734b099c2b9aa2fa4d1
Author: Michael Gratton <mike vee net>
Date:   Tue Jan 15 14:19:07 2019 +1100

    Fix build with new FolderPath API

 src/client/application/geary-controller.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/client/application/geary-controller.vala b/src/client/application/geary-controller.vala
index 8a498cde..0d66b72a 100644
--- a/src/client/application/geary-controller.vala
+++ b/src/client/application/geary-controller.vala
@@ -2778,7 +2778,7 @@ public class GearyController : Geary.BaseObject {
         // if folder contains children, we must ensure that there is at least one of the same type
         Geary.SpecialFolderType type = folder.special_folder_type;
         foreach (Geary.Folder other in all) {
-            if (other.special_folder_type == type && other.path.get_parent() == folder.path)
+            if (other.special_folder_type == type && other.path.parent == folder.path)
                 return true;
         }