gfs2: Eliminate gh parameter from go_xmote_bh func

The only glock that uses go_xmote_bh glops function is the freeze glock
which uses freeze_go_xmote_bh. It does not use its gh parameter, so
this patch eliminates the unneeded parameter.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>