tracing/eprobe: Show syntax error logs in error_log file

Show the syntax errors for event probes in error_log file as same as
other dynamic events, so that user can understand what is the problem.

Link: https://lkml.kernel.org/r/165932113556.2850673.3483079297896607612.stgit@devnote2

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