sstables: finish streaming_histogram::update
sstables: finish streaming_histogram::update

This method was incomplete, and thus would fail if map size were
greater than max_bin_size, bringing the application down.

Signed-off-by: Raphael S. Carvalho <1e2942cea40e3b4d2162dfcd9e53e41c05a84d22@cloudius-systems.com>
Reviewed-by: Pekka Enberg <add4fcd06328a394f0ad91feda7ee057316dc5ed@cloudius-systems.com>
stamhe/scylla,scylladb/scylla,justintung/scylla,rluta/scylla,phonkee/scylla,stamhe/scylla,acbellini/scylla,wildinto/scylla,shaunstanislaus/scylla,respu/scylla,raphaelsc/scylla,avikivity/scylla,linearregression/scylla,phonkee/scylla,eklitzke/scylla,tempbottle/scylla,dwdm/scylla,kangkot/scylla,acbellini/scylla,bowlofstew/scylla,guiquanz/scylla,phonkee/scylla,bowlofstew/scylla,glommer/scylla,kangkot/scylla,asias/scylla,linearregression/scylla,scylladb/scylla,rluta/scylla,dwdm/scylla,aruanruan/scylla,gwicke/scylla,scylladb/scylla,stamhe/scylla,wildinto/scylla,glommer/scylla,bowlofstew/scylla,kangkot/scylla,tempbottle/scylla,aruanruan/scylla,kjniemi/scylla,victorbriz/scylla,shaunstanislaus/scylla,duarten/scylla,scylladb/scylla,eklitzke/scylla,tempbottle/scylla,capturePointer/scylla,guiquanz/scylla,asias/scylla,duarten/scylla,victorbriz/scylla,asias/scylla,victorbriz/scylla,eklitzke/scylla,kjniemi/scylla,wildinto/scylla,glommer/scylla,kjniemi/scylla,senseb/scylla,gwicke/scylla,acbellini/scylla,gwicke/scylla,capturePointer/scylla,raphaelsc/scylla,duarten/scylla,senseb/scylla,capturePointer/scylla,shaunstanislaus/scylla,linearregression/scylla,rentongzhang/scylla,raphaelsc/scylla,avikivity/scylla,dwdm/scylla,senseb/scylla,justintung/scylla,justintung/scylla,aruanruan/scylla,rluta/scylla,respu/scylla,rentongzhang/scylla,avikivity/scylla,rentongzhang/scylla,guiquanz/scylla,respu/scylla