fix failures found by randomconfig builds

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

libbb/Kbuild.src

@@ -144,7 +144,7 @@ lib-$(CONFIG_DELUSER) += update_passwd.o
 lib-$(CONFIG_PASSWD) += pw_encrypt.o update_passwd.o obscure.o
 lib-$(CONFIG_CHPASSWD) += pw_encrypt.o update_passwd.o
 lib-$(CONFIG_CRYPTPW) += pw_encrypt.o
-lib-$(CONFIG_SULOGIN) += pw_encrypt.o
+lib-$(CONFIG_SULOGIN) += pw_encrypt.o correct_password.o
 lib-$(CONFIG_VLOCK) += pw_encrypt.o correct_password.o
 lib-$(CONFIG_SU) += pw_encrypt.o correct_password.o
 lib-$(CONFIG_LOGIN) += pw_encrypt.o correct_password.o

libbb/correct_password.c

@@ -30,15 +30,6 @@
 
 #include "libbb.h"
 
-void FAST_FUNC nuke_str(char *str)
-{
-        if (str) {
-		while (*str)
-			*str++ = 0;
-		/* or: memset(str, 0, strlen(str)); - not as small as above */
-	}
-}
-
 /* Ask the user for a password.
  * Return 1 without asking if PW has an empty password.
  * Return -1 on EOF, error while reading input, or timeout.

libbb/in_ether.c

@@ -3,6 +3,7 @@
  * Utility routines.
  */
 
+//kbuild:lib-$(CONFIG_ARP) += in_ether.o
 //kbuild:lib-$(CONFIG_IFCONFIG) += in_ether.o
 //kbuild:lib-$(CONFIG_IFENSLAVE) += in_ether.o
 

libbb/nuke_str.c

@@ -0,0 +1,21 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) 2008 Denys Vlasenko
+ *
+ * Licensed under GPLv2, see file LICENSE in this source tree.
+ */
+
+//kbuild:lib-y += nuke_str.o
+
+#include "libbb.h"
+
+void FAST_FUNC nuke_str(char *str)
+{
+        if (str) {
+		while (*str)
+			*str++ = 0;
+		/* or: memset(str, 0, strlen(str)); - not as small as above */
+	}
+}