ovl: update ->f_iocb_flags when ovl_change_flags() modifies ->f_flags

ovl_change_flags() is an open-coded variant of fs/fcntl.c:setfl() and it
got missed by commit 164f4064 ("keep iocb_flags() result cached in
struct file"); the same change applies there.
Reported-by: Pierre Labastie <pierre.labastie@neuf.fr>
Fixes: 164f4064 ("keep iocb_flags() result cached in struct file")
Cc: <stable@vger.kernel.org> # v6.0
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216738Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

fs/overlayfs/file.c

@@ -96,6 +96,7 @@ static int ovl_change_flags(struct file *file, unsigned int flags)
 
 	spin_lock(&file->f_lock);
 	file->f_flags = (file->f_flags & ~OVL_SETFL_MASK) | flags;
+	file->f_iocb_flags = iocb_flags(file);
 	spin_unlock(&file->f_lock);
 
 	return 0;