[cli] fix arg count checks in dataset command (#3533)
[cli] fix arg count checks in dataset command (#3533)


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