libtraceevent: Show what the failed expected tokens are

Instead of just showing a very cryptic message of what enum type was
expected and failed during parsing, at least include the name of said
type.

Link: https://lore.kernel.org/linux-trace-devel/20220221154418.2449fa19@rorschach.local.home

Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
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