[hail patch 3/3] Use a constant like elsewhere

Actually a competent compiler should replace this strlen with a
constant expression, so a performance win is unlikely, but why
bother if we already have this constant and use it in similar cases?

Signed-off-by: Pete Zaitcev <[email protected]>

---
 lib/chunkdc.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/chunkdc.c b/lib/chunkdc.c
index 3f1994e..13f5d36 100644
--- a/lib/chunkdc.c
+++ b/lib/chunkdc.c
@@ -139,9 +139,9 @@ static bool net_write(struct st_client *stc, const void *data, size_t datalen)
 
 static bool resp_valid(const struct chunksrv_resp *resp)
 {
-	if (memcmp(resp->magic, CHUNKD_MAGIC, strlen(CHUNKD_MAGIC)))
+	if (memcmp(resp->magic, CHUNKD_MAGIC, CHD_MAGIC_SZ))
 		return false;
-	
+
 	return true;
 }