minishell/readline.supp

{
   <readline>
   Memcheck:Leak
   match-leak-kinds: reachable
   ...
   fun:readline
   ...
}
{
   <add_history>
   Memcheck:Leak
   match-leak-kinds: reachable
   ...
   fun:xmalloc
   ...
   fun:add_history
   ...
}