[PATCHv2] ipv4: ipconfig: avoid unused ic_proto_used symbol

[David Miller]

From: Arnd Bergmann <arnd at arndb.de>
Date: Thu, 28 Jan 2016 17:39:24 +0100

> When CONFIG_PROC_FS, CONFIG_IP_PNP_BOOTP, CONFIG_IP_PNP_DHCP and
> CONFIG_IP_PNP_RARP are all disabled, we get a warning about the
> ic_proto_used variable being unused:
> 
> net/ipv4/ipconfig.c:146:12: error: 'ic_proto_used' defined but not used [-Werror=unused-variable]
> 
> This avoids the warning, by making the definition conditional on
> whether a dynamic IP configuration protocol is configured. If not,
> we know that the value is always zero, so we can optimize away the
> variable and all code that depends on it.
> 
> Signed-off-by: Arnd Bergmann <arnd at arndb.de>

Applied.