usb: mon: Change return type to vm_fault_t

Use new return type vm_fault_t for the fault handler
in struct vm_operations_struct. 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 -> 1c8f422059ae ("mm: change return type to
vm_fault_t")

Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/mon/mon_bin.c

@@ -1227,7 +1227,7 @@ static void mon_bin_vma_close(struct vm_area_struct *vma)
 /*
  * Map ring pages to user space.
  */
-static int mon_bin_vma_fault(struct vm_fault *vmf)
+static vm_fault_t mon_bin_vma_fault(struct vm_fault *vmf)
 {
 	struct mon_reader_bin *rp = vmf->vma->vm_private_data;
 	unsigned long offset, chunk_idx;