Fix memory leak in ppc stackwalker

BUG=756317

Change-Id: Id096372e5a0d1e7c70e95304b1f0c181f57d3882
Reviewed-on: https://chromium-review.googlesource.com/619126
Reviewed-by: Leonard Mosescu <mosescu@chromium.org>
Cr-Mirrored-From: https://chromium.googlesource.com/breakpad/breakpad
Cr-Mirrored-Commit: b1e7ec065d5d7312fd4534d8231a6164276cb281
1 file changed