[LLC]: llc_sap_list_lock really does need to be exported.

For the case where CONFIG_LLC2 is modular and thus
llc_proc.c needs to get at this symbol.
Signed-off-by: David S. Miller <davem@davemloft.net>

net/llc/llc_core.c

@@ -169,6 +169,7 @@ module_exit(llc_exit);
 
 EXPORT_SYMBOL(llc_station_mac_sa);
 EXPORT_SYMBOL(llc_sap_list);
+EXPORT_SYMBOL(llc_sap_list_lock);
 EXPORT_SYMBOL(llc_sap_find);
 EXPORT_SYMBOL(llc_sap_open);
 EXPORT_SYMBOL(llc_sap_close);