NFC: digital: Set current target active on activate_target() call

The curr_protocol field of nfc_digital_dev structure used to determine
if a target is currently active was set too soon, immediately when a
target is found. This is not good since there is no other way than
deactivate_target() to reset curr_protocol and if activate_target() is
not called, the target remains active and it's not possible to put the
device in poll mode anymore.

With this patch curr_protocol is set when nfc core activates a target,
puts a device up, or when an ATR_REQ is received in target mode.

Signed-off-by: Thierry Escande <thierry.escande@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/net/nfc/digital_dep.c b/net/nfc/digital_dep.c
index 470a0b4..562bec9 100644
--- a/net/nfc/digital_dep.c
+++ b/net/nfc/digital_dep.c
@@ -681,6 +681,8 @@
 		ddev->skb_check_crc = digital_skb_check_crc_none;
 	}
 
+	ddev->curr_protocol = NFC_PROTO_NFC_DEP_MASK;
+
 	rc = ddev->skb_check_crc(resp);
 	if (rc) {
 		PROTOCOL_ERR("14.4.1.6");