NFC: nci: memory leak in nci_core_conn_create()

I've moved the check for "number_destination_params" forward
a few lines to avoid leaking "cmd".

Fixes: caa575a8

 ('NFC: nci: fix possible crash in nci_core_conn_create')

Acked-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>