uio: Change return type to vm_fault_t

Use new return type vm_fault_t for 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 inst
ances are converted, vm_fault_t will become a di
stinct type.

Reference - 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/uio/uio.c

@@ -597,7 +597,7 @@ static int uio_find_mem_index(struct vm_area_struct *vma)
 	return -1;
 }
 
-static int uio_vma_fault(struct vm_fault *vmf)
+static vm_fault_t uio_vma_fault(struct vm_fault *vmf)
 {
 	struct uio_device *idev = vmf->vma->vm_private_data;
 	struct page *page;