selftests: ftrace: Introduce TMPDIR for temporary files
Introduce TMPDIR variable which is removed after each test is done, so that the test script can put their temporary files in that. Link: http://lkml.kernel.org/r/147928406116.22982.8761924340108532378.stgit@devboxSigned-off-by: NMasami Hiramatsu <mhiramat@kernel.org> Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>
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