[PATCH] minios xc_evtchn_unbind missing return

[Diego Ongaro <diego.ongaro@citrix.com>]

minios: Error case when unbinding unknown port in xc_evtchn_unbind is
missing a return statement.

Signed-off-by: Diego Ongaro <diego.ongaro@citrix.com>
---
diff --git a/tools/libxc/xc_minios.c b/tools/libxc/xc_minios.c
--- a/tools/libxc/xc_minios.c
+++ b/tools/libxc/xc_minios.c
@@ -259,8 +259,11 @@ int xc_evtchn_unbind(int xce_handle, evt
 	    files[xce_handle].evtchn.ports[i].port = -1;
 	    break;
 	}
-    if (i == MAX_EVTCHN_PORTS)
+    if (i == MAX_EVTCHN_PORTS) {
 	printf("Warning: couldn't find port %"PRId32" for xc handle %x\n", port, xce_handle);
+	errno = -EINVAL;
+	return -1;
+    }
     files[xce_handle].evtchn.ports[i].bound = 0;
     unbind_evtchn(port);
     return 0;