net: llc: Correct function name llc_sap_action_unitdata_ind() in header

Fix the following make W=1 kernel build warning:

  net/llc/llc_s_ac.c:38: warning: expecting prototype for llc_sap_action_unit_data_ind(). Prototype was for llc_sap_action_unitdata_ind() instead
Reported-by: NHulk Robot <hulkci@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/llc/llc_s_ac.c

@@ -27,7 +27,7 @@
 
 
 /**
- *	llc_sap_action_unit_data_ind - forward UI PDU to network layer
+ *	llc_sap_action_unitdata_ind - forward UI PDU to network layer
  *	@sap: SAP
  *	@skb: the event to forward
  *