tracing: Call trace_ftrace_test_filter() for the event

The trace event filter bootup self test tests a bunch of filter logic
against the ftrace_test_filter event, but does not actually call the
event. Work is being done to cause a warning if an event is defined but
not used. To quiet the warning call the trace event under an if statement
where it is disabled so it doesn't get optimized out.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nicolas Schier <nicolas.schier@linux.dev>
Cc: Nick Desaulniers <nick.desaulniers+lkml@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/20250723194212.274458858@kernel.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Author: rostedt

kernel/trace/trace_events_filter.c

@@ -2900,6 +2900,10 @@ static __init int ftrace_test_event_filter(void)
 	if (i == DATA_CNT)
 		printk(KERN_CONT "OK\n");
 
+	/* Need to call ftrace_test_filter to prevent a warning */
+	if (!trace_ftrace_test_filter_enabled())
+		trace_ftrace_test_filter(1, 2, 3, 4, 5, 6, 7, 8);
+
 	return 0;
 }