[sheepdog] [PATCH] group: fix compile error

[Liu Yuan]

----
roup.c:361:45: warning: argument to ‘sizeof’ in ‘memcpy’ call is the same expression as the destination; did you mean to dereference it? [-Wsizeof-pointer-memaccess]
    memcpy(timestamp, buf + nodes_len, sizeof(timestamp));
----

We should pass the real length instead of length of pointer

Signed-off-by: Liu Yuan <namei.unix at gmail.com>
---
 sheep/group.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sheep/group.c b/sheep/group.c
index 3074e1c..16f1532 100644
--- a/sheep/group.c
+++ b/sheep/group.c
@@ -355,10 +355,10 @@ int epoch_log_read_remote(uint32_t epoch, struct sd_node *nodes, int len,
 		if (ret != SD_RES_SUCCESS)
 			continue;
 
-		nodes_len = rsp->data_length - sizeof(timestamp);
+		nodes_len = rsp->data_length - sizeof(*timestamp);
 		memcpy((void *)nodes, buf, nodes_len);
 		if (timestamp)
-			memcpy(timestamp, buf + nodes_len, sizeof(timestamp));
+			memcpy(timestamp, buf + nodes_len, sizeof(*timestamp));
 
 		return nodes_len / sizeof(struct sd_node);
 	}
-- 
1.7.9.5