[ALPHA] Fix Jensen -Werror failures.

From Marc Zyngier <mzyngier@freesurf.fr>.

arch/alpha/kernel/pci-noop.c

@@ -48,7 +48,6 @@ asmlinkage long
 sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn)
 {
 	struct pci_controller *hose;
-	struct pci_dev *dev;
 
 	/* from hose or from bus.devfn */
 	if (which & IOBASE_FROM_HOSE) {
@@ -106,6 +105,7 @@ sys_pciconfig_write(unsigned long bus, unsigned long dfn,
 void *
 pci_alloc_consistent(struct pci_dev *pdev, size_t size, dma_addr_t *dma_addrp)
 {
+	return NULL;
 }
 void
 pci_free_consistent(struct pci_dev *pdev, size_t size, void *cpu_addr,
@@ -116,6 +116,7 @@ dma_addr_t
 pci_map_single(struct pci_dev *pdev, void *cpu_addr, size_t size,
 	       int direction)
 {
+	return (dma_addr_t) 0;
 }
 void
 pci_unmap_single(struct pci_dev *pdev, dma_addr_t dma_addr, size_t size,