nfc: st21nfcb: Add missing break statement in switch section

Add missing break statement when ST21NFCB_EVT_TRANSACTION switch
section ends.

Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/nfc/st21nfcb/st21nfcb_se.c b/drivers/nfc/st21nfcb/st21nfcb_se.c
index 455b9c2..6df7b95 100644
--- a/drivers/nfc/st21nfcb/st21nfcb_se.c
+++ b/drivers/nfc/st21nfcb/st21nfcb_se.c
@@ -340,6 +340,7 @@
 		       transaction->aid_len + 4, transaction->params_len);
 
 		r = nfc_se_transaction(ndev->nfc_dev, host, transaction);
+		break;
 	default:
 		return 1;
 	}