[esock] Keep valgrind happy
[esock] Keep valgrind happy

An attempt to keep valgrind happy.
Memzero each control message header structure,
so that even the padding gets a value.

OTP-16197

erlang/otp,bjorng/otp,ferd/otp,vladdu/otp,lrascao/otp,g-andrade/otp,dgud/otp,isvilen/otp,kvakvs/otp,vladdu/otp,rlipscombe/otp,dgud/otp,rlipscombe/otp,electricimp/otp,ferd/otp,vladdu/otp,rlipscombe/otp,potatosalad/otp,vinoski/otp,lrascao/otp,uabboli/otp,lrascao/otp,jj1bdx/otp,erlang/otp,getong/otp,emacsmirror/erlang,dumbbell/otp,vladdu/otp,emacsmirror/erlang,bjorng/otp,dgud/otp,g-andrade/otp,bjorng/otp,jj1bdx/otp,mikpe/otp,kvakvs/otp,isvilen/otp,dumbbell/otp,potatosalad/otp,uabboli/otp,rlipscombe/otp,mikpe/otp,vinoski/otp,getong/otp,lrascao/otp,vinoski/otp,lrascao/otp,lrascao/otp,g-andrade/otp,ferd/otp,jj1bdx/otp,bjorng/otp,bjorng/otp,kvakvs/otp,bjorng/otp,uabboli/otp,isvilen/otp,dumbbell/otp,getong/otp,erlang/otp,isvilen/otp,ferd/otp,electricimp/otp,potatosalad/otp,electricimp/otp,jj1bdx/otp,potatosalad/otp,bjorng/otp,jj1bdx/otp,ferd/otp,lrascao/otp,vinoski/otp,potatosalad/otp,kvakvs/otp,potatosalad/otp,potatosalad/otp,erlang/otp,erlang/otp,vladdu/otp,vinoski/otp,getong/otp,vladdu/otp,potatosalad/otp,uabboli/otp,isvilen/otp,bjorng/otp,vinoski/otp,electricimp/otp,g-andrade/otp,g-andrade/otp,bjorng/otp,rlipscombe/otp,uabboli/otp,mikpe/otp,erlang/otp,jj1bdx/otp,vladdu/otp,dumbbell/otp,mikpe/otp,dgud/otp,emacsmirror/erlang,dgud/otp,getong/otp,uabboli/otp,getong/otp,emacsmirror/erlang,dgud/otp,kvakvs/otp,getong/otp,vladdu/otp,dumbbell/otp,jj1bdx/otp,kvakvs/otp,emacsmirror/erlang,mikpe/otp,dumbbell/otp,mikpe/otp,dumbbell/otp,potatosalad/otp,dumbbell/otp,dumbbell/otp,uabboli/otp,mikpe/otp,lrascao/otp,uabboli/otp,potatosalad/otp,kvakvs/otp,emacsmirror/erlang,vinoski/otp,jj1bdx/otp,ferd/otp,dumbbell/otp,erlang/otp,erlang/otp,g-andrade/otp,isvilen/otp,isvilen/otp,emacsmirror/erlang,dgud/otp,mikpe/otp,ferd/otp,g-andrade/otp,emacsmirror/erlang,getong/otp,getong/otp,mikpe/otp,g-andrade/otp,emacsmirror/erlang,jj1bdx/otp,dgud/otp,jj1bdx/otp,erlang/otp,dgud/otp,uabboli/otp,kvakvs/otp,ferd/otp,rlipscombe/otp,dgud/otp,rlipscombe/otp,vinoski/otp,vinoski/otp,electricimp/otp,electricimp/otp,emacsmirror/erlang,g-andrade/otp,g-andrade/otp,lrascao/otp,electricimp/otp,rlipscombe/otp,isvilen/otp,electricimp/otp,vladdu/otp,rlipscombe/otp,vinoski/otp,erlang/otp,electricimp/otp,mikpe/otp,isvilen/otp,ferd/otp,kvakvs/otp,bjorng/otp,isvilen/otp,getong/otp,rlipscombe/otp