tracing: Convert function graph set_flags() to use a switch() statement

Currently the set_flags() of the function graph tracer has a bunch of:

  if (bit == FLAG1) {
	[..]
  }

  if (bit == FLAG2) {
	[..]
  }

To clean it up a bit, convert it over to a switch statement.

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>
Link: https://patch.msgid.link/20251114192319.117123664@kernel.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Author: rostedt

kernel/trace/trace_functions_graph.c

@@ -1664,27 +1664,29 @@ func_graph_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
 	if (!!set == !!(tr->current_trace_flags->val & bit))
 		return 0;
 
-	if (bit == TRACE_GRAPH_SLEEP_TIME) {
+	switch (bit) {
+	case TRACE_GRAPH_SLEEP_TIME:
 		if (set) {
 			fgraph_no_sleep_time--;
 			if (WARN_ON_ONCE(fgraph_no_sleep_time < 0))
 				fgraph_no_sleep_time = 0;
 		} else {
 			fgraph_no_sleep_time++;
 		}
-	}
+		break;
 
-	if (bit == TRACE_GRAPH_PRINT_IRQS) {
+	case TRACE_GRAPH_PRINT_IRQS:
 		if (set)
 			ftrace_graph_skip_irqs--;
 		else
 			ftrace_graph_skip_irqs++;
 		if (WARN_ON_ONCE(ftrace_graph_skip_irqs < 0))
 			ftrace_graph_skip_irqs = 0;
-	}
+		break;
 
-	if (bit == TRACE_GRAPH_ARGS)
+	case TRACE_GRAPH_ARGS:
 		return ftrace_graph_trace_args(tr, set);
+	}
 
 	return 0;
 }