Previously, if creating the file and fstat() fails, we would've ended up
calling utimensat() on that file anyways with whatever was in sb.

Not that this is an error likely to happen...

We don't check for the return value of close() as we aren't writing
anything to the file and the file is created on success of open().

Fixes: cb54c500d0e1 ("touch: don't leak descriptor if fstat(2) fails")
Sponsored by: Klara, Inc.