xenpaging: catch xc_mem_paging_resume errors

In the unlikely event that xc_mem_paging_resume() fails, do not overwrite the
error with the return value from xc_evtchn_notify()

Signed-off-by: Olaf Hering <olaf@aepfle.de>

---
 tools/xenpaging/xenpaging.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Index: xen-4.1.1-testing/tools/xenpaging/xenpaging.c
===================================================================
--- xen-4.1.1-testing.orig/tools/xenpaging/xenpaging.c
+++ xen-4.1.1-testing/tools/xenpaging/xenpaging.c
@@ -405,8 +405,9 @@ static int xenpaging_resume_page(xenpagi
     /* Tell Xen page is ready */
     ret = xc_mem_paging_resume(paging->xc_handle, paging->mem_event.domain_id,
                                rsp->gfn);
-    ret = xc_evtchn_notify(paging->mem_event.xce_handle,
-                           paging->mem_event.port);
+    if ( ret == 0 ) 
+        ret = xc_evtchn_notify(paging->mem_event.xce_handle,
+                               paging->mem_event.port);
 
  out:
     return ret;