RDMA/srpt: Add a newline when printing parameter 'srpt_service_guid' by sysfs

When I cat module parameter 'srpt_service_guid', it displays as follows.
It is better to add a newline for easy reading.

[root@hulk-202 ~]# cat /sys/module/ib_srpt/parameters/srpt_service_guid
0x0205cdfffe8346b9[root@hulk-202 ~]#

Link: https://lore.kernel.org/r/1589182629-27743-1-git-send-email-wangxiongfeng2@huawei.comSigned-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/ulp/srpt/ib_srpt.c

@@ -81,7 +81,7 @@ MODULE_PARM_DESC(srpt_srq_size,
 
 static int srpt_get_u64_x(char *buffer, const struct kernel_param *kp)
 {
-	return sprintf(buffer, "0x%016llx", *(u64 *)kp->arg);
+	return sprintf(buffer, "0x%016llx\n", *(u64 *)kp->arg);
 }
 module_param_call(srpt_service_guid, NULL, srpt_get_u64_x, &srpt_service_guid,
 		  0444);