perf probe: Check new event name

Check new event name is same syntax as a C symbol in perf command.
In other words, checking the name is as like as other tracepoint
events.

This can prevent user to create an event with useless name (e.g.
foo|bar, foo*bar).

Signed-off-by: Masami Hiramatsu <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Jim Keniston <[email protected]>
Cc: Ananth N Mavinakayanahalli <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Jason Baron <[email protected]>
Cc: K.Prasad <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Srikar Dronamraju <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: systemtap <[email protected]>
Cc: DLE <[email protected]>
LKML-Reference: <[email protected]>
[ v2: minor cleanups ]
Signed-off-by: Ingo Molnar <[email protected]>

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