tracing: Fix synthetic event to accept unsigned modifier

Steven Rostedt lkml stable 1 version Oct 20, 2018 New

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#	Subject and files	Size	Replies
1/3	tracing: Fix synthetic event to accept unsigned modifier`kernel/trace/trace_events_hist.c`	+24 -6	0 replies
2/3	tracing: Fix synthetic event to allow semicolon at end`kernel/trace/trace_events_hist.c`	+1 -1	0 replies
3/3	selftests: ftrace: Add synthetic event syntax testcase`tools/testing/selftests/ftrace/test.d/trigger/inter-event/trigger-synthetic-event-syntax.tc`	+80 -0	0 replies

1 of 3 patches has a Reviewed-by or Acked-by.

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