Use proper print format/casting when converting msg_channel handle

Use proper print format/casting when converting msg_channel handle

The current casting triggers a warning on 32bit:

    init.c:1842:66: error: cast from pointer to integer of different size
[-Werror=pointer-to-int-cast]

Use the proper printf format specifier for printing a pointer avoiding
the cast alltogether.

In options.c use a cast to intptr_t before converting to a handle to
avoid having to ifdef atoll/atol for 32/64 bit.

Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: Lev Stipakov <lstipakov@gmail.com>
Message-Id: <20230214134323.1033590-1-arne@rfc2549.org>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg26255.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>