rds: remove the unneed NULL checking

unregister_net_sysctl_table will check the ctl_table_header,
so remove the unneed checking
Signed-off-by: Wang Weidong <wangweidong1@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/rds/iw_sysctl.c

@@ -111,7 +111,6 @@ static struct ctl_table rds_iw_sysctl_table[] = {
 
 void rds_iw_sysctl_exit(void)
 {
-	if (rds_iw_sysctl_hdr)
 	unregister_net_sysctl_table(rds_iw_sysctl_hdr);
 }
 

net/rds/sysctl.c

@@ -94,7 +94,6 @@ static struct ctl_table rds_sysctl_rds_table[] = {
 
 void rds_sysctl_exit(void)
 {
-	if (rds_sysctl_reg_table)
 	unregister_net_sysctl_table(rds_sysctl_reg_table);
 }