x86: Fix the build.

Signed-off-by: Keir Fraser <keir.fraser@citrix.com>

diff --git a/xen/drivers/passthrough/amd/iommu_map.c b/xen/drivers/passthrough/amd/iommu_map.c
index 24ff5eacb892e763c763dd0a8c9bc229a15e36fa..aa584e615fd3d3f2768d74d342dbe37e287ecaa1 100644 (file)
--- a/xen/drivers/passthrough/amd/iommu_map.c
+++ b/xen/drivers/passthrough/amd/iommu_map.c
@@ -505,7 +505,7 @@ int amd_iommu_sync_p2m(struct domain *d)
     int ir = IOMMU_IO_READ_ENABLED;
 
     if ( !is_hvm_domain(d) )
-        return;
+        return 0;
 
     hd = domain_hvm_iommu(d);