fix a typo in my_nets, to not throw away all the remote networks

git-svn-id: https://svn.code.sf.net/p/xcat/code/xcat-core/branches/2.7@14611 8638fb3e-16cb-4fca-ae20-7b5d299a9bcd

perl-xCAT/xCAT/Utils.pm

@@ -2384,7 +2384,7 @@ sub my_nets
       my $n = $_->{net};
       my $if = $_->{mgtifname};
       my $nm = $_->{mask};
-      if (!$n || !$if || $nm)
+      if (!$n || !$if || !$nm)
       {
           next; #incomplete network
       }