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tr: preserve autoincrement, if the third argument of .nr is missing

Reported and tested by Meino Cramer <mylists@posteo.de>.

--- a/tr.c

+++ b/tr.c

@@ -49,7 +49,8 @@

 		return;

 	id = map(args[1]);

 	num_set(id, eval_re(args[2], num_get(id), 'u'));

-	num_setinc(id, args[3] ? eval(args[3], 'u') : 0);

+	if (args[3])

+		num_setinc(id, eval(args[3], 'u'));

 }

 static void tr_rr(char **args)