vfs_fruit: remove a fsp check from ad_fset()

vfs_fruit: remove a fsp check from ad_fset()

This comes from times before we had pathref fsps. Back then if you wanted to
check if fsp->fh->fd contained a valid value != -1, you'd also first check that
the passed in fsp and fsp->fh are non NULL. With pathref fsps we don't need this
anymore.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14890
RN: Crash in vfs_fruit asking for fsp_get_io_fd() for an XATTR call

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
(cherry picked from commit 50c550e1ad422a1220d0862a3f637e5fb774f288)