sk: Do not lookup a socket twice
sk: Do not lookup a socket twice

The socket_desc is being looked up in dump_unix/dump_inet. In
the dump_socket this desc is only required to obtain a family,
which in turn can be done with a getsockopt.

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

wtf42/criu,tych0/criu,gablg1/criu,kawamuray/criu,LK4D4/criu,efiop/criu,kawamuray/criu,KKoukiou/criu-remote,KKoukiou/criu-remote,AuthenticEshkinKot/criu,tych0/criu,eabatalov/criu,KKoukiou/criu-remote,eabatalov/criu,biddyweb/criu,gablg1/criu,fbocharov/criu,wtf42/criu,marcosnils/criu,AuthenticEshkinKot/criu,LK4D4/criu,rentzsch/criu,eabatalov/criu,biddyweb/criu,sdgdsffdsfff/criu,gablg1/criu,gonkulator/criu,LK4D4/criu,AuthenticEshkinKot/criu,gonkulator/criu,efiop/criu,fbocharov/criu,wtf42/criu,marcosnils/criu,gonkulator/criu,fbocharov/criu,ldu4/criu,tych0/criu,efiop/criu,svloyso/criu,ldu4/criu,svloyso/criu,gablg1/criu,sdgdsffdsfff/criu,biddyweb/criu,AuthenticEshkinKot/criu,tych0/criu,kawamuray/criu,kawamuray/criu,sdgdsffdsfff/criu,LK4D4/criu,fbocharov/criu,sdgdsffdsfff/criu,gonkulator/criu,fbocharov/criu,marcosnils/criu,wtf42/criu,marcosnils/criu,ldu4/criu,fbocharov/criu,LK4D4/criu,wtf42/criu,efiop/criu,AuthenticEshkinKot/criu,KKoukiou/criu-remote,AuthenticEshkinKot/criu,eabatalov/criu,ldu4/criu,rentzsch/criu,eabatalov/criu,tych0/criu,marcosnils/criu,svloyso/criu,eabatalov/criu,rentzsch/criu,rentzsch/criu,sdgdsffdsfff/criu,rentzsch/criu,rentzsch/criu,biddyweb/criu,svloyso/criu,svloyso/criu,sdgdsffdsfff/criu,wtf42/criu,ldu4/criu,biddyweb/criu,gonkulator/criu,tych0/criu,KKoukiou/criu-remote,efiop/criu,gonkulator/criu,marcosnils/criu,gablg1/criu,kawamuray/criu,kawamuray/criu,ldu4/criu,LK4D4/criu,KKoukiou/criu-remote,svloyso/criu,gablg1/criu,efiop/criu,biddyweb/criu