Return an int32 for netlink SO_RCVBUF
Return an int32 for netlink SO_RCVBUF

Untyped integer constants default to type int and the binary package will panic
if one tries to encode an int.

PiperOrigin-RevId: 223890001
Change-Id: Iccc3afd6d74bad24c35d764508e450fd317b76ec

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor