perf hisi-ptt: Fix one memory leakage in hisi_ptt_process_auxtrace_event()

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8MEWF


CVE: NA

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ASan complains a memory leakage in hisi_ptt_process_auxtrace_event()
that the data buffer is not freed. Since currently we only support
the raw dump trace mode, the data buffer is used only within this
function. So fix this by freeing the data buffer before going out.

Fixes: 5e91e57e ("perf auxtrace arm64: Add support for parsing HiSilicon PCIe Trace packet")
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Signed-off-by: Junhao He <hejunhao3@huawei.com>