blktap2: properly suppress compiler warning

Signed-off-by: Jan Beulich <jbeulich@novell.com>

diff --git a/drivers/xen/blktap2/device.c b/drivers/xen/blktap2/device.c
index bcf261fa76338ac766507be3c63e2d67dda69d3e..966f4c1190fe64450aef2b8663b432078d99fe5a 100644 (file)
--- a/drivers/xen/blktap2/device.c
+++ b/drivers/xen/blktap2/device.c
@@ -611,8 +611,8 @@ blktap_map(struct blktap *tap,
                        struct gnttab_unmap_grant_ref unmap;
                        gnttab_set_unmap_op(&unmap, kvaddr,
                                            GNTMAP_host_map, gref);
-                       (void)HYPERVISOR_grant_table_op(
-                               GNTTABOP_unmap_grant_ref, &unmap, 1);
+                       VOID(HYPERVISOR_grant_table_op(
+                               GNTTABOP_unmap_grant_ref, &unmap, 1));
                } else
                        request->handles[seg].kernel = gref;
        }