erts: Fix heap overflow in maps:remove/2 when key is not found

One key-value pair too many was copied.
erts: Fix compile warning in io.c for windows
ssh: Fix dialyzer warning for arg Data in ssh_connection_handler:send/4
Merge branch 'hans/ssh/dialyzer_warning/OTP-11821'
Merge branch 'sverk/win-warning-io'

* sverk/win-warning-io:
  erts: Fix compile warning in io.c for windows
Merge branch 'sverk/maps_remove_bug'

* sverk/maps_remove_bug:
  erts: Fix heap overflow in maps:remove/2 when key is not found