ftrace: Add back ftrace_update_trampoline() to ftrace_update_pid_func()

The update to the ops trampoline done by the function
ftrace_update_trampoline() was accidentally removed from
ftrace_update_pid_func(). Add it back.

Link: https://lore.kernel.org/linux-trace-kernel/20240605205337.6115e9a5@gandalf.local.home

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>
Fixes: df3ec5da ("function_graph: Add pid tracing back to function graph tracer")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

kernel/trace/ftrace.c

@@ -402,6 +402,7 @@ static void ftrace_update_pid_func(void)
 		if (op->flags & FTRACE_OPS_FL_PID) {
 			op->func = ftrace_pids_enabled(op) ?
 				ftrace_pid_func : op->saved_func;
+			ftrace_update_trampoline(op);
 		}
 	} while_for_each_ftrace_op(op);