NFC: st21nfcb: Do not remove header once the payload is sent

NFC: st21nfcb: Do not remove header once the payload is sent

commit 09f39a950523b1bb830c30a8670b77e0067da092 upstream.

Once the data is sent, we need to preserve the full frame for
the ndlc state machine. If the NDLC ACK is not received in time,
the ndlc layer will resend the same frame.
Having the header byte pulled will corrupt the frame.

Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>