nxm: fix MFField putw
nxm: fix MFField putw

Fix another regression of commit 3b3bcaa7591e3f11f328d82bee3800f407f14e3d.

Signed-off-by: FUJITA Tomonori <93dac1fe9c4b2a3957982200319981492ad4976e@lab.ntt.co.jp>

umkcdcrg01/ryu_openflow,diogommartins/ryu,darjus-amzn/ryu,gareging/SDN_Framework,StephenKing/summerschool-2015-ryu,muzixing/ryu,fujita/ryu,alanquillin/ryu,o3project/ryu-oe,TakeshiTseng/ryu,evanscottgray/ryu,StephenKing/ryu,sivaramakrishnansr/ryu,openvapour/ryu,ynkjm/ryu,ynkjm/ryu,alyosha1879/ryu,OpenState-SDN/ryu,jkoelker/ryu,gareging/SDN_Framework,Zouyiran/ryu,ysywh/ryu,castroflavio/ryu,zyq001/ryu,citrix-openstack-build/ryu,TakeshiTseng/ryu,alanquillin/ryu,openvapour/ryu,fkakuma/ryu,osrg/ryu,torufuru/OFPatchPanel,umkcdcrg01/ryu_openflow,fujita/ryu,Zouyiran/ryu,Tesi-Luca-Davide/ryu,fkakuma/ryu,diogommartins/ryu,habibiefaried/ryu,alanquillin/ryu,ykaneko/ryu,lagopus/ryu-lagopus-ext,shinpeimuraoka/ryu,gareging/SDN_Framework,alyosha1879/ryu,alanquillin/ryu,Tesi-Luca-Davide/ryu,John-Lin/ryu,pichuang/ryu,openvapour/ryu,mikhaelharswanto/ryu,zangree/ryu,Tejas-Subramanya/RYU_MEC,fkakuma/ryu,elahejalalpour/ELRyu,jkoelker/ryu,John-Lin/ryu,mikhaelharswanto/ryu,TakeshiTseng/ryu,OpenState-SDN/ryu,StephenKing/summerschool-2015-ryu,lzppp/mylearning,jazzmes/ryu,umkcdcrg01/ryu_openflow,citrix-openstack-build/ryu,haniehrajabi/ryu,John-Lin/ryu,habibiefaried/ryu,jkoelker/ryu,muzixing/ryu,iwaseyusuke/ryu,ynkjm/ryu,lzppp/mylearning,umkcdcrg01/ryu_openflow,lsqtongxin/ryu,Tesi-Luca-Davide/ryu,ntts-clo/mld-ryu,muzixing/ryu,lagopus/ryu-lagopus-ext,jalilm/ryu,citrix-openstack/build-ryu,zyq001/ryu,zangree/ryu,jalilm/ryu,takahashiminoru/ryu,elahejalalpour/ELRyu,lzppp/mylearning,ykaneko/ryu,iwaseyusuke/ryu,muzixing/ryu,samrussell/ryu,takahashiminoru/ryu,haniehrajabi/ryu,Zouyiran/ryu,iwaseyusuke/ryu,unifycore/ryu,Zouyiran/ryu,Tesi-Luca-Davide/ryu,fujita/ryu,ntts-clo/mld-ryu,lsqtongxin/ryu,jalilm/ryu,habibiefaried/ryu,osrg/ryu,jazzmes/ryu,takahashiminoru/ryu,fkakuma/ryu,yamt/ryu,yamt/ryu,TakeshiTseng/ryu,takahashiminoru/ryu,habibiefaried/ryu,gopchandani/ryu,yamada-h/ryu,zyq001/ryu,zangree/ryu,gareging/SDN_Framework,jalilm/ryu,ttsubo/ryu,OpenState-SDN/ryu,lsqtongxin/ryu,ysywh/ryu,shinpeimuraoka/ryu,OpenState-SDN/ryu,ynkjm/ryu,ysywh/ryu,haniehrajabi/ryu,castroflavio/ryu,osrg/ryu,sivaramakrishnansr/ryu,StephenKing/summerschool-2015-ryu,torufuru/oolhackathon,StephenKing/ryu,osrg/ryu,hisaharu/ryu,gareging/SDN_Framework,StephenKing/summerschool-2015-ryu,pichuang/ryu,openvapour/ryu,gopchandani/ryu,darjus-amzn/ryu,ysywh/ryu,evanscottgray/ryu,gopchandani/ryu,elahejalalpour/ELRyu,John-Lin/ryu,elahejalalpour/ELRyu,o3project/ryu-oe,sivaramakrishnansr/ryu,citrix-openstack/build-ryu,yamt/ryu,John-Lin/ryu,castroflavio/ryu,ttsubo/ryu,jalilm/ryu,darjus-amzn/ryu,ntts-clo/ryu,haniehrajabi/ryu,hisaharu/ryu,StephenKing/summerschool-2015-ryu,pichuang/ryu,zyq001/ryu,StephenKing/ryu,TakeshiTseng/ryu,lagopus/ryu-lagopus-ext,torufuru/OFPatchPanel,Tejas-Subramanya/RYU_MEC,ttsubo/ryu,jazzmes/ryu,Tesi-Luca-Davide/ryu,umkcdcrg01/ryu_openflow,pichuang/ryu,yamada-h/ryu,alyosha1879/ryu,iwaseyusuke/ryu,shinpeimuraoka/ryu,StephenKing/ryu,takahashiminoru/ryu,hisaharu/ryu,gopchandani/ryu,lzppp/mylearning,Tejas-Subramanya/RYU_MEC,ysywh/ryu,hisaharu/ryu,alanquillin/ryu,fkakuma/ryu,sivaramakrishnansr/ryu,evanscottgray/ryu,lagopus/ryu-lagopus-ext,zangree/ryu,ttsubo/ryu,sivaramakrishnansr/ryu,iwaseyusuke/ryu,Zouyiran/ryu,StephenKing/ryu,Tejas-Subramanya/RYU_MEC,hisaharu/ryu,yamt/ryu,shinpeimuraoka/ryu,torufuru/oolhackathon,lagopus/ryu-lagopus-ext,lsqtongxin/ryu,unifycore/ryu,muzixing/ryu,alyosha1879/ryu,darjus-amzn/ryu,diogommartins/ryu,ntts-clo/ryu,shinpeimuraoka/ryu,lzppp/mylearning,torufuru/oolhackathon,fujita/ryu,samrussell/ryu,gopchandani/ryu,haniehrajabi/ryu,habibiefaried/ryu,pichuang/ryu,elahejalalpour/ELRyu,ttsubo/ryu,lsqtongxin/ryu,Tejas-Subramanya/RYU_MEC,zyq001/ryu,fujita/ryu,ynkjm/ryu,OpenState-SDN/ryu,openvapour/ryu,darjus-amzn/ryu,yamt/ryu,zangree/ryu,diogommartins/ryu,osrg/ryu,diogommartins/ryu