Staging: otus: drop redundant memset

The region set by the call to memset is immediately overwritten by the
subsequent call to memcpy.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression e1,e2,e3,e4;
@@

- memset(e1,e2,e3);
  memcpy(e1,e4,e3);
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/otus/wwrap.c

@@ -956,7 +956,6 @@ int zfLnxCencSendMsg(struct sock *netlink_sk, u_int8_t *msg, int len)
 	/*填写数据报相关信息*/
 	nlh = NLMSG_PUT(skb, 0, 0, WAI_K_MSG, size-sizeof(*nlh));
 	pos = NLMSG_DATA(nlh);
-	memset(pos, 0, len);
 
 	/*传输到用户空间的数据*/
 	memcpy(pos, msg,  len);