[travis] fix scan-build check (#3155)
[travis] fix scan-build check (#3155)


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