net: fix build with CONFIG_NET=n

fs/built-in.o:(.rodata+0x1134): undefined reference to `proc_net_inode_operations'
fs/built-in.o:(.rodata+0x1138): undefined reference to `proc_net_operations'

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

fs/proc/base.c

diff --git a/fs/proc/base.c b/fs/proc/base.c
index cc43cf0..3217774 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2274,7 +2274,9 @@
 	DIR("task",       S_IRUGO|S_IXUGO, task),
 	DIR("fd",         S_IRUSR|S_IXUSR, fd),
 	DIR("fdinfo",     S_IRUSR|S_IXUSR, fdinfo),
+#ifdef CONFIG_NET
 	DIR("net",        S_IRUGO|S_IXUSR, net),
+#endif
 	REG("environ",    S_IRUSR, environ),
 	INF("auxv",       S_IRUSR, pid_auxv),
 	ONE("status",     S_IRUGO, pid_status),