row consumer: fix read_bytes temporary len
row consumer: fix read_bytes temporary len

It shouldn't be _u16, but rather whatever we passed as len. It currently works
because all callers pass _u16 as len. But this will soon change.

Signed-off-by: Glauber Costa <f8b79557d19b40666ebe336545a0b6178af65685@cloudius-systems.com>
Reviewed-by: Nadav Har'El <625169824b719df98706d88646d0aae6f368ae4d@cloudius-systems.com>

kjniemi/scylla,justintung/scylla,glommer/scylla,linearregression/scylla,raphaelsc/scylla,aruanruan/scylla,phonkee/scylla,shaunstanislaus/scylla,gwicke/scylla,glommer/scylla,tempbottle/scylla,duarten/scylla,guiquanz/scylla,asias/scylla,aruanruan/scylla,acbellini/scylla,wildinto/scylla,capturePointer/scylla,asias/scylla,stamhe/scylla,stamhe/scylla,respu/scylla,linearregression/scylla,tempbottle/scylla,phonkee/scylla,wildinto/scylla,respu/scylla,gwicke/scylla,guiquanz/scylla,avikivity/scylla,victorbriz/scylla,rentongzhang/scylla,kangkot/scylla,acbellini/scylla,respu/scylla,bowlofstew/scylla,dwdm/scylla,acbellini/scylla,victorbriz/scylla,shaunstanislaus/scylla,bowlofstew/scylla,eklitzke/scylla,avikivity/scylla,eklitzke/scylla,rentongzhang/scylla,senseb/scylla,dwdm/scylla,linearregression/scylla,shaunstanislaus/scylla,senseb/scylla,kjniemi/scylla,eklitzke/scylla,scylladb/scylla,rluta/scylla,guiquanz/scylla,aruanruan/scylla,phonkee/scylla,rentongzhang/scylla,justintung/scylla,asias/scylla,kjniemi/scylla,glommer/scylla,duarten/scylla,bowlofstew/scylla,senseb/scylla,dwdm/scylla,rluta/scylla,justintung/scylla,gwicke/scylla,capturePointer/scylla,raphaelsc/scylla,stamhe/scylla,avikivity/scylla,kangkot/scylla,duarten/scylla,rluta/scylla,kangkot/scylla,wildinto/scylla,raphaelsc/scylla,tempbottle/scylla,scylladb/scylla,capturePointer/scylla,victorbriz/scylla,scylladb/scylla,scylladb/scylla