infiniband: hw: qib: Change return type to vm_fault_t

Use new return type vm_fault_t for fault handler. For
now, this is just documenting that the function returns
a VM_FAULT value rather than an errno. Once all instances
are converted, vm_fault_t will become a distinct type.

Reference id -> 1c8f4220 ("mm: change return type to
vm_fault_t")
Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/qib/qib_file_ops.c

@@ -868,7 +868,7 @@ static int mmap_rcvegrbufs(struct vm_area_struct *vma,
 /*
  * qib_file_vma_fault - handle a VMA page fault.
  */
-static int qib_file_vma_fault(struct vm_fault *vmf)
+static vm_fault_t qib_file_vma_fault(struct vm_fault *vmf)
 {
 	struct page *page;