tracing/filter: Change filter_match_preds function to use walk_pred_tree

Changing filter_match_preds function to use unified predicates tree
processing.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1313072754-4620-10-git-send-email-jolsa@redhat.com


Signed-off-by: Steven Rostedt <rostedt@goodmis.org>