packet: try harder in prepend_uninitialized_header()
packet: try harder in prepend_uninitialized_header()

unuse_internal_data() may make it possible to use the internal data after
all, so try to use it again.

acbellini/seastar,koolhazz/seastar,linearregression/seastar,hongliangzhao/seastar,scylladb/scylla-seastar,wildinto/seastar,xtao/seastar,cloudius-systems/seastar,koolhazz/seastar,sjperkins/seastar,dreamsxin/seastar,stamhe/seastar,chunshengster/seastar,norcimo5/seastar,syuu1228/seastar,jonathanleang/seastar,tempbottle/seastar,scylladb/scylla-seastar,wildinto/seastar,chunshengster/seastar,jonathanleang/seastar,hongliangzhao/seastar,scylladb/scylla-seastar,linearregression/seastar,leejir/seastar,dwdm/seastar,jonathanleang/seastar,hongliangzhao/seastar,shyamalschandra/seastar,avikivity/seastar,kjniemi/seastar,dreamsxin/seastar,mixja/seastar,joerg84/seastar,mixja/seastar,norcimo5/seastar,shyamalschandra/seastar,anzihenry/seastar,avikivity/seastar,syuu1228/seastar,syuu1228/seastar,stamhe/seastar,anzihenry/seastar,xtao/seastar,scylladb/seastar,xtao/seastar,bowlofstew/seastar,leejir/seastar,kjniemi/seastar,flashbuckets/seastar,scylladb/seastar,mixja/seastar,dwdm/seastar,kjniemi/seastar,bowlofstew/seastar,avikivity/seastar,cloudius-systems/seastar,dreamsxin/seastar,flashbuckets/seastar,linearregression/seastar,anzihenry/seastar,stamhe/seastar,norcimo5/seastar,acbellini/seastar,sjperkins/seastar,koolhazz/seastar,sjperkins/seastar,printedheart/seastar,tempbottle/seastar,tempbottle/seastar,leejir/seastar,flashbuckets/seastar,shyamalschandra/seastar,printedheart/seastar,printedheart/seastar,cloudius-systems/seastar,joerg84/seastar,dwdm/seastar,acbellini/seastar,joerg84/seastar,bowlofstew/seastar,wildinto/seastar,chunshengster/seastar,scylladb/seastar