perf test: Reset err after using it hold errcode in hist testcases
All hists test cases forget to reset err after using it to hold an error code. If error occure in setup_fake_machine() it incorrectly return TEST_OK. This patch fixes it. Suggested-and-Acked-by: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Wang Nan <wangnan0@huawei.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Zefan Li <lizefan@huawei.com> Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/1452520124-2073-13-git-send-email-wangnan0@huawei.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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