optlen parameter of getsockopt() of type socklen_t* was read into
variable of type socklen_t, that caused zeroing out of upper 4 bytes
when running s390x on top of x86_64. This patch changes optlen type
to abi_ulong.
Signed-off-by: NPavel Zbitskiy <pavel.zbitskiy@gmail.com>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>