ceph: Use kmemdup rather than duplicating its implementation

---
 net/ceph/crypto.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
 
diff --git a/net/ceph/crypto.c b/net/ceph/crypto.c
index 85f3bc0..b780cb7 100644
--- a/net/ceph/crypto.c
+++ b/net/ceph/crypto.c
@@ -15,10 +15,9 @@ int ceph_crypto_key_clone(struct ceph_crypto_key *dst,
 			  const struct ceph_crypto_key *src)
 {
 	memcpy(dst, src, sizeof(struct ceph_crypto_key));
-	dst->key = kmalloc(src->len, GFP_NOFS);
+	dst->key = kmemdup(src->key, src->len, GFP_NOFS);
 	if (!dst->key)
 		return -ENOMEM;
-	memcpy(dst->key, src->key, src->len);
 	return 0;
 }