virterror.c: don't read beyond end of buffer upon OOM

* src/virterror.c (virReportSystemErrorFull): Fix typo in
my previous change.  Patch by Daniel P. Berrange.

ChangeLog

+Tue Jan 27 13:25:16 +0100 2009 Jim Meyering <meyering@redhat.com>
+
+	virterror.c: don't read beyond end of buffer upon OOM
+	* src/virterror.c (virReportSystemErrorFull): Fix typo in
+	my previous change.  Patch by Daniel P. Berrange.
+
 Tue Jan 27 10:48:12 IST 2009 Mark McLoughlin <markmc@redhat.com>
 
 	kvm/virtio: Set IFF_VNET_HDR when setting up tap fds

src/virterror.c

@@ -1059,7 +1059,7 @@ void virReportSystemErrorFull(virConnectPtr conn,
         }
     }
 
-    if (!msgDetailBuf)
+    if (!msgDetail)
         msgDetail = errnoDetail;
 
     virRaiseError(conn, NULL, NULL, domcode, VIR_ERR_SYSTEM_ERROR, VIR_ERR_ERROR,