selftests/ftrace: Make a script checkbashisms clean
Make kprobe_ftrace.tc checkbashisms clean. Since "grep function available_tracers" causes an error on checkbashisms, fix it by explicitly escaping with double-quotations. Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
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