libnl incorrectly handles the object not found case

[Sitbon Nicolas]

Hi,
Removing non existent route (both ipv4 and ipv6) using rtnl_route_delete 
return NLE_FAILURE generic error code. After investigation, it seems the 
linux kernel return -ESRCH in that case (see 
http://lxr.linux.no/linux+v2.6.38/net/ipv6/route.c#L1367). Same 
behaviour apply for removing non existent address. The function 
nl_syserr2nlerr (lib/error.c) which is responsible for translating from 
kernel error to libnl error doesn't handle ESRCH. The problem is present 
at least in version 2.0 and 3.0 of libnl. I propose a patch for the 3.0 
in attachment.
Regards.
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