sunrpc: add missing newline when printing parameter 'pool_mode' by sysfs

When I cat parameter '/sys/module/sunrpc/parameters/pool_mode', it
displays as follows. It is better to add a newline for easy reading.

[root@hulk-202 ~]# cat /sys/module/sunrpc/parameters/pool_mode
global[root@hulk-202 ~]#
Signed-off-by: NXiongfeng Wang <wangxiongfeng2@huawei.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

net/sunrpc/svc.c

@@ -88,15 +88,15 @@ param_get_pool_mode(char *buf, const struct kernel_param *kp)
 	switch (*ip)
 	{
 	case SVC_POOL_AUTO:
-		return strlcpy(buf, "auto", 20);
+		return strlcpy(buf, "auto\n", 20);
 	case SVC_POOL_GLOBAL:
-		return strlcpy(buf, "global", 20);
+		return strlcpy(buf, "global\n", 20);
 	case SVC_POOL_PERCPU:
-		return strlcpy(buf, "percpu", 20);
+		return strlcpy(buf, "percpu\n", 20);
 	case SVC_POOL_PERNODE:
-		return strlcpy(buf, "pernode", 20);
+		return strlcpy(buf, "pernode\n", 20);
 	default:
-		return sprintf(buf, "%d", *ip);
+		return sprintf(buf, "%d\n", *ip);
 	}
 }