[posix-app] fix aliasing issue (#3579)
[posix-app] fix aliasing issue (#3579)


turon/openthread,openthread/openthread,abtink/openthread,librasungirl/openthread,chshu/openthread,bukepo/openthread,chshu/openthread,chshu/openthread,lanyuwen/openthread,turon/openthread,chshu/openthread,abtink/openthread,lanyuwen/openthread,librasungirl/openthread,srickardti/openthread,bukepo/openthread,bukepo/openthread,chshu/openthread,lanyuwen/openthread,abtink/openthread,jwhui/openthread,jwhui/openthread,jwhui/openthread,lanyuwen/openthread,jwhui/openthread,openthread/openthread,turon/openthread,srickardti/openthread,lanyuwen/openthread,lanyuwen/openthread,turon/openthread,abtink/openthread,chshu/openthread,bukepo/openthread,openthread/openthread,srickardti/openthread,openthread/openthread,librasungirl/openthread,srickardti/openthread,librasungirl/openthread