xhci: check port array allocation was successful before dereferencing it

return if rhub->ports is null after rhub->ports = kcalloc_node()
Klockwork reported issue

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20210406070208.3406266-2-mathias.nyman@linux.intel.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>