Add some debugging.

tbsetup/libvtop.pm.in

@@ -1306,6 +1306,13 @@ sub GenFixNodes($)
 	my $vnode = $self->vnodes()->{$vname};
 	my $fixed = $self->fixednodes()->{$vname};
 
+	if (!defined($vnode)) {
+	    tbwarn("GenFixNodes: No vnode for $vname\n");
+	}
+	if (!defined($fixed)) {
+	    tbwarn("GenFixNodes: No fixed node for $vname\n");
+	}
+
 	#
 	# Temporary rspec generation.
 	#