ftrace: Test for NULL iter->tr in regex for stack_trace_filter changes
As writing into stack_trace_filter, the iter-tr is not set and is NULL. Check if it is NULL before dereferencing it in ftrace_regex_release(). Fixes: 8c08f0d5 ("ftrace: Have cached module filters be an active filter") Signed-off-by:Steven Rostedt (VMware) <rostedt@goodmis.org>
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