tracing: Add free_trace_iter_content() helper function

As the trace iterator is created and used by various interfaces, the clean
up of it needs to be consistent. Create a free_trace_iter_content() helper
function that frees the content of the iterator and use that to clean it
up in all places that it is used.

Link: https://lkml.kernel.org/r/[email protected]

Cc: Mark Rutland <[email protected]>
Cc: Andrew Morton <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>
Reviewed-by: Masami Hiramatsu (Google) <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>

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