[klibc] Fix implementation of utimes

[klibc] Fix implementation of utimes

Origin: https://git.kernel.org/pub/scm/libs/klibc/klibc.git/commit/?id=a13b588a915d3a4498bf342d85524eb7dde71594

This was not correctly initializing the timespec array before passing it
on to utimensat.

Tested: Built cpio and extracted an image with `cpio -im` to preserve
mtime. The calls to utime now pass through the correct timestamps.

Signed-off-by: Benjamin Gwin <bgwin@google.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Gbp-Pq: Name klibc-fix-implementation-of-utimes.patch