storage/posix: Remove a redundant lstat in posix_handle_hard.

Change-Id: I9129b71d5568eff3513c17e3607256783fdc42ec
BUG: 903396
Signed-off-by: Mohammed Junaid <junaid@redhat.com>
Reviewed-on: http://review.gluster.org/4641
Reviewed-by: Peter Portante <pportant@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>