tools perf util: Make rm_rf(path) argument const
rm_rf() doesn't modify its path argument, and a future caller will pass a string constant into it to delete. Signed-off-by: NJoe Stringer <joe@ovn.org> Cc: Alexei Starovoitov <ast@fb.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Wang Nan <wangnan0@huawei.com> Cc: netdev@vger.kernel.org Link: http://lkml.kernel.org/r/20170126212001.14103-5-joe@ovn.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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