tracing: Have function_graph use trace_seq_has_overflowed()

Instead of doing individual checks all over the place that makes the code
very messy. Just check trace_seq_has_overflowed() at the end or in
strategic places.

This makes the code much cleaner and also helps with getting closer
to removing the return values of trace_seq_printf() and friends.

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

Reviewed-by: Petr Mladek <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>

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