Some simple bugs fixed at github

[Thomas Graf]

On Wed, Aug 29, 2012 at 05:58:54AM -0400, Thomas Graf wrote:
> On Tue, Aug 28, 2012 at 12:03:55AM +0600, Марк Коренберг wrote:
> > Please see git://github.com/socketpair/libnl.git
> > 
> > branch named "bugs", last two commits.
> 
> All applied, thanks!

The change to const char ** caused the following build warnings:

../include/netlink/utils.h:47:15: note: expected 'const char **' but argument is of type 'char **'
route/link/inet6.c:300:11: warning: passing argument 2 of 'nl_cancel_down_bytes' from incompatible pointer type [enabled by default]

so I reverted that change