[dot11] fix uint8 overflow
[dot11] fix uint8 overflow

urso/gopacket,ccordes-snaproute/gopacket,rouzier/gopacket,nhooyr/gopacket,adriantam/gopacket,josephcopenhaver/gopacket,breml/gopacket,ross-williams/gopacket,vtolstov/gopacket,google/gopacket,josephcopenhaver/gopacket,vtolstov/gopacket,1d4Nf6/gopacket,rouzier/gopacket,google/gopacket,breml/gopacket,1d4Nf6/gopacket,adriantam/gopacket,LrsK/gopacket,zerklabs/gopacket,UIKit0/gopacket-1,skyportsystems/gopacket,ross-williams/gopacket,rouzier/gopacket,nhooyr/gopacket,UIKit0/gopacket-1,skyportsystems/gopacket,josephcopenhaver/gopacket,xuzhaokui/gopacket,zerklabs/gopacket,ccordes-snaproute/gopacket,ccordes-snaproute/gopacket,levigross/gopacket,1d4Nf6/gopacket,aeppert/gopacket,xuzhaokui/gopacket,UIKit0/gopacket-1,urso/gopacket,levigross/gopacket,zerklabs/gopacket,ross-williams/gopacket,xuzhaokui/gopacket,adriantam/gopacket,LrsK/gopacket,skyportsystems/gopacket,aeppert/gopacket,urso/gopacket,aeppert/gopacket,LrsK/gopacket,levigross/gopacket,breml/gopacket,nhooyr/gopacket,google/gopacket,vtolstov/gopacket