net: smc: fix missing brace warning for old compilers

For older versions of gcc, the array = {0}; will cause warnings:

net/smc/smc_llc.c: In function 'smc_llc_send_link_delete_all':
net/smc/smc_llc.c:1317:9: warning: missing braces around initializer [-Wmissing-braces]
  struct smc_llc_msg_del_link delllc = {0};
         ^
net/smc/smc_llc.c:1317:9: warning: (near initialization for 'delllc.hd') [-Wmissing-braces]

1 warnings generated

Fixes: f3811fd7 ("net/smc: send DELETE_LINK, ALL message and wait for send to complete")
Signed-off-by: Pujin Shi <shipujin.t@gmail.com>
Acked-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/smc/smc_llc.c

@@ -1314,7 +1314,7 @@ static void smc_llc_process_cli_delete_link(struct smc_link_group *lgr)
  */
 void smc_llc_send_link_delete_all(struct smc_link_group *lgr, bool ord, u32 rsn)
 {
-	struct smc_llc_msg_del_link delllc = {0};
+	struct smc_llc_msg_del_link delllc = {};
 	int i;
 
 	delllc.hd.common.type = SMC_LLC_DELETE_LINK;