Fix error when using UDPs without --bbox-unsup

src/V3LinkResolve.cpp

@@ -366,8 +366,8 @@ private:
 		    }
 		}
 	    }
+	    nodep->unlinkFrBack(); pushDeletep(nodep); nodep=NULL;
 	}
-	nodep->unlinkFrBack(); pushDeletep(nodep); nodep=NULL;
     }
 
     virtual void visit(AstScCtor* nodep, AstNUser*) {

test_regress/t/t_lint_unused_bad.pl

@@ -10,7 +10,7 @@ if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); di
 $Self->{vlt} or $Self->skip("Verilator only test");
 
 compile (
-    v_flags2 => ["--lint-only --bbox-sys -Wall -Wno-DECLFILENAME"],
+    v_flags2 => ["--lint-only --bbox-sys --bbox-unsup -Wall -Wno-DECLFILENAME"],
     fails=>1,
     verilator_make_gcc => 0,
     make_top_shell => 0,

test_regress/t/t_udp_bad.pl

@@ -0,0 +1,24 @@
+#!/usr/bin/perl
+if (!$::Driver) { use FindBin; exec("$FindBin::Bin/bootstrap.pl", @ARGV, $0); die; }
+# DESCRIPTION: Verilator: Verilog Test driver/expect definition
+#
+# Copyright 2003 by Wilson Snyder. This program is free software; you can
+# redistribute it and/or modify it under the terms of either the GNU
+# Lesser General Public License Version 3 or the Perl Artistic License
+# Version 2.0.
+
+top_filename("t/t_udp.v");
+
+compile (
+	 fails=>$Self->{vlt},
+	 expect=>
+'%Error: t/t_udp.v:\d+: Unsupported: Verilog 1995 UDP Tables.  Use --bbox-unsup to ignore tables.
+%Error: t/t_udp.v:\d+: Unsupported: Verilog 1995 UDP Tables.  Use --bbox-unsup to ignore tables.
+%Error: Exiting due to '
+	 );
+
+execute (
+     ) if !$Self->{vlt};
+
+ok(1);
+1;