perf tests x86: Fix memory leak in sample_ustack()
The buf is not freed, when kernel failed to get stack map and return. Signed-off-by: NMasanari Iida <standby24x7@gmail.com> Link: http://lkml.kernel.org/r/1398091024-7901-1-git-send-email-standby24x7@gmail.comSigned-off-by: NJiri Olsa <jolsa@redhat.com>
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