kerdat: don't leak a file descriptor

288             if (flock(fd, LOCK_SH)) {
289                     pr_perror("Can't take a lock\n");
>>> >>>     CID 92726:  Resource leaks  (RESOURCE_LEAK)
>>> >>>     Handle variable "fd" going out of scope leaks the handle.
290                     return -1;
291             }

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>