ext4: add missing initialization of call_notify_error in update_super_work()

Fixes: ff0722de ("ext4: add periodic superblock update check")
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

fs/ext4/super.c

@@ -768,7 +768,8 @@ static void update_super_work(struct work_struct *work)
 	 */
 	if (!sb_rdonly(sbi->s_sb) && journal) {
 		struct buffer_head *sbh = sbi->s_sbh;
-		bool call_notify_err;
+		bool call_notify_err = false;
+
 		handle = jbd2_journal_start(journal, 1);
 		if (IS_ERR(handle))
 			goto write_directly;