cxl: Free virtual PHB when removing

When adding a vPHB in cxl_pci_vphb_add(), we allocate a pci_controller
struct using pcibios_alloc_controller(). However, we don't free it in
cxl_pci_vphb_remove(), causing a leak.

Call pcibios_free_controller() in cxl_pci_vphb_remove() to free the vPHB
data structure correctly.
Signed-off-by: Daniel Axtens <dja@axtens.net>
Signed-off-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

drivers/misc/cxl/vphb.c

@@ -290,8 +290,10 @@ void cxl_pci_vphb_remove(struct cxl_afu *afu)
 		return;
 
 	phb = afu->phb;
+	afu->phb = NULL;
 
 	pci_remove_root_bus(phb->bus);
+	pcibios_free_controller(phb);
 }
 
 struct cxl_afu *cxl_pci_to_afu(struct pci_dev *dev)