tracing: Add NULL trace-array check in print_synth_event()
Add NULL trace-array check in print_synth_event(), because if we enable tp_printk option, iter->tr can be NULL. Link: http://lkml.kernel.org/r/157867236536.17873.12529350542460184019.stgit@devnote2Signed-off-by: NMasami Hiramatsu <mhiramat@kernel.org> Signed-off-by: NSteven Rostedt (VMware) <rostedt@goodmis.org>
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