UPSTREAM: tracing: Have error path in predicate_parse() free its allocated memory

In predicate_parse, there is an error path that is not going to
out_free instead it returns directly which leads to a memory leak.

Link: http://lkml.kernel.org/r/20190920225800.3870-1-navid.emamdoost@gmail.com

Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

BUG=b:145385009
TEST=emerge-lakitu sys-kernel/lakitu-kernel-4_19

Signed-off-by: Ke Wu <mikewu@google.com>
(cherry picked from commit 96c5c6e6a5b6db592acae039fed54b5c8844cd35)

Change-Id: I9a66c900b35cbaed386a9b41b61d6a1e1c633bfa
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/1952465
Reviewed-by: Vaibhav Rustagi <vaibhavrustagi@google.com>
Commit-Queue: Ke Wu <mikewu@google.com>
Tested-by: Ke Wu <mikewu@google.com>
(cherry picked from commit 99be03fed25f38b7794e6e46feae2aa7a2fd9abc)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/1959666
Reviewed-by: Sean Paul <seanpaul@chromium.org>