trace: make the trace_event callbacks return enum print_line_t
As they actually all return these enumerators. Reported-by: NFrederic Weisbecker <fweisbec@gmail.com> Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com> Acked-by: NFrederic Weisbecker <fweisbec@gmail.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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