[NET]: Do not protect sysctl_optmem_max with CONFIG_SYSCTL

The ipv4 and ipv6 protocols need to access it unconditionally.
SYSCTL=n build failure reported by Russell King.
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/sock.h

@@ -1377,9 +1377,10 @@ extern void sk_init(void);
 
 #ifdef CONFIG_SYSCTL
 extern struct ctl_table core_table[];
-extern int sysctl_optmem_max;
 #endif
 
+extern int sysctl_optmem_max;
+
 extern __u32 sysctl_wmem_default;
 extern __u32 sysctl_rmem_default;
 

net/core/sock.c

@@ -1719,8 +1719,8 @@ EXPORT_SYMBOL(sock_wfree);
 EXPORT_SYMBOL(sock_wmalloc);
 EXPORT_SYMBOL(sock_i_uid);
 EXPORT_SYMBOL(sock_i_ino);
-#ifdef CONFIG_SYSCTL
 EXPORT_SYMBOL(sysctl_optmem_max);
+#ifdef CONFIG_SYSCTL
 EXPORT_SYMBOL(sysctl_rmem_max);
 EXPORT_SYMBOL(sysctl_wmem_max);
 #endif