tracing/filters: Fix coding style issues

Recent commits have introduced some coding style issues, fix those up.

Link: https://lkml.kernel.org/r/20230901151039.125186-5-vschneid@redhat.com

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Valentin Schneider <vschneid@redhat.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>