ipv6: Fail with appropriate error code when setting not-applicable sockopt.
IPV6_MULTICAST_HOPS, for example, is not valid for stream sockets.
Since they are virtually unavailable for stream sockets,
we should return ENOPROTOOPT instead of EINVAL.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
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