staging: lustre: info leak in lnet_ping()

On 64 bit systems there is a 4 byte hole after the last member of the
struct.  We should clear it to avoid disclosing stack information.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lnet/lnet/api-ni.c

@@ -1927,6 +1927,7 @@ lnet_ping (lnet_process_id_t id, int timeout_ms, lnet_process_id_t *ids, int n_i
 
 	rc = -EFAULT;			   /* If I SEGV... */
 
+	memset(&tmpid, 0, sizeof(tmpid));
 	for (i = 0; i < n_ids; i++) {
 		tmpid.pid = info->pi_pid;
 		tmpid.nid = info->pi_ni[i].ns_nid;