clients: ivi-shell-user-interface, remove casts to (void)

> I don't think we need these casts. The warning about unused arguments is disabled, isn't it?
> You should be able to remove casts to (void) from all places.

Signed-off-by: Nobuhiko Tanibata <NOBUHIKO_TANIBATA@xddp.denso.co.jp>
ivi-shell: ivi-layout.c,  Remove casts to (void)

> I don't think we need these casts. The warning about unused arguments is disabled, isn't it?
> You should be able to remove casts to (void) from all places.

Signed-off-by: Nobuhiko Tanibata <NOBUHIKO_TANIBATA@xddp.denso.co.jp>
hmi-controller: Remove casts to (void)

> I don't think we need these casts. The warning about unused arguments is
> disabled, isn't it?
> You should be able to remove casts to (void) from all places.

Signed-off-by: Nobuhiko Tanibata <NOBUHIKO_TANIBATA@xddp.denso.co.jp>