The find_map helper is already there, so let's use it.

Also we're going to introduce wider search in following patch, so it'll
be easier to make this change on single place.
Signed-off-by: NJiri Olsa <jolsa@kernel.org>
Tested-by: NNoel Grandin <noelgrandin@gmail.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1452158050-28061-4-git-send-email-jolsa@kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>