orangefs: make struct orangefs_file_vm_ops static

The struct orangefs_file_vm_ops is local to the source and does not need
to be in global scope, so make it static.

Cleans up sparse warning:
fs/orangefs/file.c:547:35: warning: symbol 'orangefs_file_vm_ops' was not
declared. Should it be static?
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>

fs/orangefs/file.c

@@ -544,7 +544,7 @@ static int orangefs_fault(struct vm_fault *vmf)
 	return filemap_fault(vmf);
 }
 
-const struct vm_operations_struct orangefs_file_vm_ops = {
+static const struct vm_operations_struct orangefs_file_vm_ops = {
 	.fault = orangefs_fault,
 	.map_pages = filemap_map_pages,
 	.page_mkwrite = filemap_page_mkwrite,