Fix last fix to nfree... turns out that if you alias a table ('from nodes as...

Fix last fix to nfree... turns out that if you alias a table ('from nodes as n') that the old name ('nodes') is no longer available, and you _must_ use the new alias ('n') to refer to it.

db/nfree.in

@@ -211,8 +211,8 @@ foreach my $n (@freed_nodes) {
     #
     my $result =
 	DBQueryFatal("select control_net,nt.osid,nt.pxe_boot_path, " .
-		     " nodes.def_boot_osid,nodes.def_boot_path, ".
-		     " node_types.isvirtnode ".
+		     " n.def_boot_osid,n.def_boot_path, ".
+		     " nt.isvirtnode ".
 		     " from node_types as nt " .
 		     "left join nodes as n on n.type=nt.type " .
 		     "where node_id='$n'");