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NFC-DEP DEP_REQ and DEP_RES exchanges using 'I' and 'ACK/NACK' PDUs have a sequence number called the Packet Number Information (PNI). The PNI is incremented (modulo 4) after every DEP_REQ/ DEP_RES pair and should be verified by the digital layer code. That verification isn't always done, though, so add code to make sure that it is done. Reviewed-by: Thierry Escande <thierry.escande@linux.intel.com> Tested-by: Thierry Escande <thierry.escande@linux.intel.com> Signed-off-by: Mark A. Greer <mgreer@animalcreek.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>