Additional sanity check.

crypto/objects/objects.pl

@@ -14,6 +14,8 @@ while(<NUMIN>)
 	$Cname =~ s/^X//;
 	if (defined($nidn{$mynum}))
 		{ die "$ARGV[1]:$o:There's already an object with NID ",$mynum," on line ",$order{$mynum},"\n"; }
+	if (defined($nid{$Cname}))
+		{ die "$ARGV[1]:$o:There's already an object with name ",$mynum," on line ",$order{$nid{$Cname}},"\n"; }
 	$nid{$Cname} = $mynum;
 	$nidn{$mynum} = $Cname;
 	$order{$mynum} = $o;