NFC: Clear pn533 target structure

The polled target structure should be memset to 0 in order to avoid
sel_res and sens_res garbage.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/nfc/pn533.c

@@ -904,6 +904,8 @@ static int pn533_target_found(struct pn533 *dev,
 	if (resp->tg != 1)
 		return -EPROTO;
 
+	memset(&nfc_tgt, 0, sizeof(struct nfc_target));
+
 	target_data_len = resp_len - sizeof(struct pn533_poll_response);
 
 	switch (dev->poll_mod_curr) {