[ncp] remove unused variable from ncp_base_mtd.cpp (#2887)
[ncp] remove unused variable from ncp_base_mtd.cpp (#2887)


gandreello/openthread,chshu/openthread,openthread/openthread,gandreello/openthread,librasungirl/openthread,abtink/openthread,turon/openthread,jwhui/openthread,gandreello/openthread,LeZhang2016/openthread,openthread/openthread,LeZhang2016/openthread,chshu/openthread,openthread/openthread,erja-gp/openthread,jwhui/openthread,bukepo/openthread,erja-gp/openthread,librasungirl/openthread,erja-gp/openthread,lanyuwen/openthread,erja-gp/openthread,abtink/openthread,erja-gp/openthread,LeZhang2016/openthread,abtink/openthread,LeZhang2016/openthread,librasungirl/openthread,jwhui/openthread,chshu/openthread,turon/openthread,srickardti/openthread,lanyuwen/openthread,LeZhang2016/openthread,chshu/openthread,erja-gp/openthread,openthread/openthread,lanyuwen/openthread,abtink/openthread,chshu/openthread,gandreello/openthread,lanyuwen/openthread,srickardti/openthread,srickardti/openthread,gandreello/openthread,turon/openthread,jwhui/openthread,bukepo/openthread,gandreello/openthread,lanyuwen/openthread,chshu/openthread,turon/openthread,srickardti/openthread,bukepo/openthread,bukepo/openthread,lanyuwen/openthread,librasungirl/openthread,LeZhang2016/openthread