x86: add compilation checks to pci_unmap_*() macros

#define PCI_DMA_BUS_IS_PHYS	(1)

/* pci_unmap_{page,single} is a nop so... */

#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)

#define DECLARE_PCI_UNMAP_LEN(LEN_NAME)

#define pci_unmap_addr(PTR, ADDR_NAME)		(0)

#define pci_unmap_addr_set(PTR, ADDR_NAME, VAL)	do { } while (0)

#define pci_unmap_len(PTR, LEN_NAME)		(0)

#define pci_unmap_len_set(PTR, LEN_NAME, VAL)	do { } while (0)

#define DECLARE_PCI_UNMAP_ADDR(ADDR_NAME)	dma_addr_t ADDR_NAME[0];

#define DECLARE_PCI_UNMAP_LEN(LEN_NAME)	unsigned LEN_NAME[0];

#define pci_unmap_addr(PTR, ADDR_NAME)	sizeof((PTR)->ADDR_NAME)

#define pci_unmap_addr_set(PTR, ADDR_NAME, VAL) \

	do { break; } while (pci_unmap_addr(PTR, ADDR_NAME))

#define pci_unmap_len(PTR, LEN_NAME)		sizeof((PTR)->LEN_NAME)

#define pci_unmap_len_set(PTR, LEN_NAME, VAL) \

	do { break; } while (pci_unmap_len(PTR, LEN_NAME))

#endif /* __KERNEL__ */