change interface to bb_xasprintf() - more perfect for me.
ln.c: error_msg(str)->error_msg(%s, str) - remove standart "feature" for hackers
reduce 100 bytes don't care in sum
diff --git a/coreutils/expr.c b/coreutils/expr.c
index 3f052d9..969d9ff 100644
--- a/coreutils/expr.c
+++ b/coreutils/expr.c
@@ -147,7 +147,7 @@
 static void tostring (VALUE *v)
 {
 	if (v->type == integer) {
-               bb_xasprintf (&(v->u.s), "%d", v->u.i);
+		v->u.s = bb_xasprintf ("%d", v->u.i);
 		v->type = string;
 	}
 }