IB/cma: use strlcpy() instead of strncpy()

gcc-8 reports

drivers/infiniband/core/cma_configfs.c: In function 'make_cma_dev':
./include/linux/string.h:245:9: warning: '__builtin_strncpy' specified
bound 64 equals destination size [-Wstringop-truncation]

We need to use strlcpy() to make sure the string is nul-terminated.
Signed-off-by: Xiongfeng Wang <xiongfeng.wang@linaro.org>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/core/cma_configfs.c

@@ -295,7 +295,7 @@ static struct config_group *make_cma_dev(struct config_group *group,
 		goto fail;
 	}
 
-	strncpy(cma_dev_group->name, name, sizeof(cma_dev_group->name));
+	strlcpy(cma_dev_group->name, name, sizeof(cma_dev_group->name));
 
 	config_group_init_type_name(&cma_dev_group->ports_group, "ports",
 				    &cma_ports_group_type);