fstream: use temporary_buffer<char>::aligned
fstream: use temporary_buffer<char>::aligned

In fstream.cc, use the convenient new temporary_buffer<char>::aligned()
function for creating an aligned temporary buffer - instead of repeating
its implementation.

Signed-off-by: Nadav Har'El <625169824b719df98706d88646d0aae6f368ae4d@cloudius-systems.com>

bowlofstew/seastar,scylladb/scylla-seastar,respu/scylla,cloudius-systems/seastar,bowlofstew/seastar,sjperkins/seastar,gwicke/scylla,senseb/scylla,shyamalschandra/seastar,senseb/scylla,kjniemi/seastar,avikivity/seastar,tempbottle/seastar,koolhazz/seastar,scylladb/scylla-seastar,jonathanleang/seastar,stamhe/seastar,anzihenry/seastar,leejir/seastar,guiquanz/scylla,xtao/seastar,flashbuckets/seastar,kjniemi/scylla,scylladb/seastar,raphaelsc/scylla,phonkee/scylla,wildinto/seastar,tempbottle/scylla,linearregression/scylla,justintung/scylla,duarten/scylla,victorbriz/scylla,capturePointer/scylla,anzihenry/seastar,avikivity/scylla,norcimo5/seastar,acbellini/seastar,phonkee/scylla,eklitzke/scylla,scylladb/scylla,avikivity/scylla,mixja/seastar,shyamalschandra/seastar,dwdm/scylla,wildinto/scylla,guiquanz/scylla,stamhe/scylla,justintung/scylla,bowlofstew/scylla,rluta/scylla,bowlofstew/scylla,duarten/scylla,dwdm/seastar,rentongzhang/scylla,eklitzke/scylla,shaunstanislaus/scylla,anzihenry/seastar,stamhe/scylla,avikivity/seastar,printedheart/seastar,raphaelsc/scylla,respu/scylla,mixja/seastar,tempbottle/seastar,chunshengster/seastar,norcimo5/seastar,leejir/seastar,xtao/seastar,kjniemi/scylla,aruanruan/scylla,shaunstanislaus/scylla,bzero/seastar,chunshengster/seastar,printedheart/seastar,stamhe/seastar,wildinto/seastar,justintung/scylla,rluta/scylla,ducthangho/imdb,gwicke/scylla,rluta/scylla,glommer/scylla,stamhe/scylla,tempbottle/scylla,shyamalschandra/seastar,sjperkins/seastar,dreamsxin/seastar,dreamsxin/seastar,shaunstanislaus/scylla,aruanruan/scylla,flashbuckets/seastar,wildinto/scylla,printedheart/seastar,jonathanleang/seastar,ducthangho/imdb,asias/scylla,raphaelsc/seastar,joerg84/seastar,raphaelsc/seastar,leejir/seastar,glommer/scylla,guiquanz/scylla,scylladb/scylla,syuu1228/seastar,hongliangzhao/seastar,victorbriz/scylla,wildinto/seastar,dwdm/seastar,linearregression/seastar,wildinto/scylla,phonkee/scylla,scylladb/scylla-seastar,mixja/seastar,kangkot/scylla,flashbuckets/seastar,rentongzhang/scylla,scylladb/seastar,linearregression/scylla,ducthangho/imdb,avikivity/seastar,raphaelsc/seastar,linearregression/seastar,senseb/scylla,norcimo5/seastar,syuu1228/seastar,glommer/scylla,linearregression/scylla,sjperkins/seastar,acbellini/scylla,koolhazz/seastar,syuu1228/seastar,tempbottle/scylla,koolhazz/seastar,kjniemi/scylla,duarten/scylla,stamhe/seastar,scylladb/scylla,jonathanleang/seastar,acbellini/scylla,asias/scylla,dwdm/scylla,xtao/seastar,bzero/seastar,avikivity/scylla,kangkot/scylla,cloudius-systems/seastar,dwdm/scylla,bowlofstew/seastar,gwicke/scylla,scylladb/scylla,bowlofstew/scylla,acbellini/scylla,aruanruan/scylla,tempbottle/seastar,bzero/seastar,raphaelsc/scylla,cloudius-systems/seastar,capturePointer/scylla,dreamsxin/seastar,joerg84/seastar,kangkot/scylla,asias/scylla,chunshengster/seastar,acbellini/seastar,joerg84/seastar,kjniemi/seastar,dwdm/seastar,respu/scylla,hongliangzhao/seastar,hongliangzhao/seastar,eklitzke/scylla,kjniemi/seastar,victorbriz/scylla,acbellini/seastar,scylladb/seastar,rentongzhang/scylla,linearregression/seastar,capturePointer/scylla