PCI: stop leaking 'slot_name' in pci_create_slot

In pci_create_slot(), the local variable 'slot_name' is allocated by
make_slot_name(), but never freed. We never use it after passing it to
the kobject core, so we should free it upon function exit.

Cc: [e-mail]
Signed-off-by: Alex Chiang <[e-mail]>
Signed-off-by: Jesse Barnes <[e-mail]>

drivers/pci/slot.c

···
 		 __func__, pci_domain_nr(parent), parent->number, slot_nr);
 
 out:
+	kfree(slot_name);
 	up_write(&pci_bus_sem);
 	return slot;
 err: