NFC: st21nfca: st21nfca_hci_i2c_probe returns st21nfca_hci_probe result.

st21nfca_hci_probe return 0 in case of successful call and a different
value in any other cases.

There is no need to check for st21nfca_hci_probe return as this will be
checked after st21nfca_hci_i2c_probe is completed.

Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>