minor change in nodestat.pm

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/trunk@1125 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

xCAT-server-2.0/lib/xcat/plugins/nodestat.pm

@@ -81,7 +81,7 @@ sub preprocess_request
     $sn = xCAT::Utils->get_ServiceNode($nodes, $service, "MN");
 
     # build each request for each service node
-
+    my @requests;
     foreach my $snkey (keys %$sn)
     {
             my $reqcopy = {%$req};