[XFRM]: Move xfrm_nl to xfrm_state.c from xfrm_user.c

xfrm_user could be modular, and since generic code uses this symbol
now...

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index cd1d5e1..037bc8e4 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -20,6 +20,9 @@
 #include <linux/module.h>
 #include <asm/uaccess.h>
 
+struct sock *xfrm_nl;
+EXPORT_SYMBOL(xfrm_nl);
+
 u32 sysctl_xfrm_aevent_etime = XFRM_AE_ETIME;
 u32 sysctl_xfrm_aevent_rseqth = XFRM_AE_SEQT_SIZE;
 /* Each xfrm_state may be linked to two tables: