s390/pci: implement pcibios_remove_bus
Implement pcibios_remove_bus to free arch specific data when a pci bus is deregistered. While at it remove a useless kzalloc/kfree wrapper. Reviewed-by: NGerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: NSebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
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