[balsa] mailbox-local: Fix a thinko

[Peter Bloomfield <peterb src gnome org>]

commit 1a4bd3c9e410d124e9b3d3840de7a3ef77612da5
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Wed Jan 15 20:34:06 2020 -0500

    mailbox-local: Fix a thinko

 libbalsa/mailbox_local.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/libbalsa/mailbox_local.c b/libbalsa/mailbox_local.c
index 8ee214ac7..8fd3ef9fc 100644
--- a/libbalsa/mailbox_local.c
+++ b/libbalsa/mailbox_local.c
@@ -662,7 +662,7 @@ lbm_local_restore_tree(LibBalsaMailboxLocal * local, guint * total)
                 /* Check one level higher. */
                 sibling = parent;
                 parent = parent->parent;
-                if (parent != NULL) {
+                if (parent == NULL) {
                     /* We got to the root without finding the parent. */
                     libbalsa_information(LIBBALSA_INFORMATION_DEBUG,
                                          _("Cache file for mailbox %s "