ia64: Remove redundant valid_mmap_phys_addr_range() from pci_mmap_page_range()

We know we are within a valid MMIO BAR by the time this function gets
called; there's no need to check.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Tested-by: Tony Luck <tony.luck@intel.com>

arch/ia64/pci/pci.c

@@ -439,9 +439,6 @@ pci_mmap_page_range (struct pci_dev *dev, int bar,
 		 */
 		return -EINVAL;
 
-	if (!valid_mmap_phys_addr_range(vma->vm_pgoff, size))
-		return -EINVAL;
-
 	prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size,
 				    vma->vm_page_prot);