anoninode: Report error when dumping unknown anon file
anoninode: Report error when dumping unknown anon file

It will fall through all the other checks, but let's do it
explicitly for better code understanding.

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

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