libxc: xc_physdev_map return -1 and populate errno.

The users of these (qemu) check for a negative value
so we are safe in regards to that. However they
also use the return value to inform the user of the
error.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

diff --git a/tools/libxc/xc_physdev.c b/tools/libxc/xc_physdev.c
index cf02d85e6d530bd1cc42042ec6782c7a6ccb2136..9b064b87878e39b1af685191542f2c0e5e2f0c1b 100644 (file)
--- a/tools/libxc/xc_physdev.c
+++ b/tools/libxc/xc_physdev.c
@@ -43,8 +43,10 @@ int xc_physdev_map_pirq(xc_interface *xch,
     struct physdev_map_pirq map;
 
     if ( !pirq )
-        return -EINVAL;
-
+    {
+        errno = EINVAL;
+        return -1;
+    }
     memset(&map, 0, sizeof(struct physdev_map_pirq));
     map.domid = domid;
     map.type = MAP_PIRQ_TYPE_GSI;
@@ -72,8 +74,10 @@ int xc_physdev_map_pirq_msi(xc_interface *xch,
     struct physdev_map_pirq map;
 
     if ( !pirq )
-        return -EINVAL;
-
+    {
+        errno = EINVAL;
+        return -1;
+    }
     memset(&map, 0, sizeof(struct physdev_map_pirq));
     map.domid = domid;
     map.type = MAP_PIRQ_TYPE_MSI;