Tab-indent Gnttab to match Gntshr
Tab-indent Gnttab to match Gntshr

$ camlp4o -printer o -no_comments lib/gnt.ml | md5sum
385ea8ad2bad3c03f3748d9c7a1a94f7  -
$ git checkout HEAD^
$ camlp4o -printer o -no_comments lib/gnt.ml | md5sum
385ea8ad2bad3c03f3748d9c7a1a94f7  -

Signed-off-by: John Else <37b74501daa612e48fea94f9846ed4ddeb6a8f07@citrix.com>

euanh/ocaml-xen-lowlevel-libs,djs55/ocaml-xen-lowlevel-libs,djs55/ocaml-xen-lowlevel-libs,djs55/ocaml-xen-lowlevel-libs,euanh/ocaml-xen-lowlevel-libs,djs55/ocaml-xen-lowlevel-libs,euanh/ocaml-xen-lowlevel-libs