Using machines__create_kernel_maps(..., HOST_KERNEL_ID) it would create
another machine instance for the host machine, and since 
1f626bc we have
it out of the machines rb_tree.
Fix it by using machine__create_kernel_maps(&self->host_machine)
directly.
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
 
 int perf_session__create_kernel_maps(struct perf_session *self)
 {
-       struct rb_root *machines = &self->machines;
-       int ret = machines__create_kernel_maps(machines, HOST_KERNEL_ID);
+       int ret = machine__create_kernel_maps(&self->host_machine);
 
        if (ret >= 0)
-               ret = machines__create_guest_kernel_maps(machines);
+               ret = machines__create_guest_kernel_maps(&self->machines);
        return ret;
 }