ice: Delete always true check of PF pointer

commit 2ff04286 upstream.

PF pointer is always valid when PCI core calls its .shutdown() and
.remove() callbacks. There is no need to check it again.

Fixes: 837f08fd ("ice: Add basic driver framework for Intel(R) E800 Series")
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>