lib-storage: mailbox_create_missing_dir() - Fix handling NULL mailbox directory

It would have caused stat(NULL), which would have failed.
Broken by 7071a02a8413fb409ade1625f6a1763c7493b66b

diff --git a/src/lib-storage/mail-storage.c b/src/lib-storage/mail-storage.c
index 75d9259126ea73264264873ea4f3632f97bbb170..fb20e3524977c86548b6b65f1edd8bb3f830f4ff 100644 (file)
--- a/src/lib-storage/mail-storage.c
+++ b/src/lib-storage/mail-storage.c
@@ -2732,7 +2732,7 @@ int mailbox_create_missing_dir(struct mailbox *box,
        if (stat(dir, &st) == 0)
                return 0;
 
-       if (null_strcmp(dir, mail_dir) != 0 &&
+       if (null_strcmp(dir, mail_dir) != 0 && mail_dir != NULL &&
            stat(mail_dir, &st) < 0 && (errno == ENOENT || errno == ENOTDIR)) {
                /* Race condition - mail root directory doesn't exist
                   anymore either. We shouldn't create this directory