remove unnecessary code in protocolmessage
remove unnecessary code in protocolmessage

pdu already is checked previously.
it means pdu is not null
so execution cannot reach removed code.

Change-Id: I2cf8a862937f197fb639f41fbf9e355841bad2e3
Signed-off-by: jihwan.seo <69598d7552022c520cfdbefd16641727c7ff4ab5@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/1034
Tested-by: jenkins-iotivity <09cb29e8a2b473a2c978382eec13ee06fa017bda@opendaylight.org>
Reviewed-by: Naga Ashok Jampani <32619ffa69e16d1824dee3fe1b220f9cc76468e4@samsung.com>
Reviewed-by: Erich Keane <ec9f61fe526c14bb62c55d7c978f025ee6b3583d@intel.com>

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