ring-buffer: Remove jump to out label in ring_buffer_swap_cpu()

The function ring_buffer_swap_cpu() has a bunch of jumps to the label out
that simply returns "ret". There's no reason to jump to a label that
simply returns a value. Just return directly from there.

This goes back to almost the beginning when commit 8aabee5
("ring-buffer: remove unneeded get_online_cpus") was introduced. That
commit removed a put_online_cpus() from that label, but never updated all
the jumps to it that now no longer needed to do anything but return a
value.

Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/20250527145753.6b45d840@gandalf.local.home
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Author: rostedt

kernel/trace/ring_buffer.c

@@ -6315,37 +6315,33 @@ int ring_buffer_swap_cpu(struct trace_buffer *buffer_a,
 
 	if (!cpumask_test_cpu(cpu, buffer_a->cpumask) ||
 	    !cpumask_test_cpu(cpu, buffer_b->cpumask))
-		goto out;
+		return -EINVAL;
 
 	cpu_buffer_a = buffer_a->buffers[cpu];
 	cpu_buffer_b = buffer_b->buffers[cpu];
 
 	/* It's up to the callers to not try to swap mapped buffers */
-	if (WARN_ON_ONCE(cpu_buffer_a->mapped || cpu_buffer_b->mapped)) {
-		ret = -EBUSY;
-		goto out;
-	}
+	if (WARN_ON_ONCE(cpu_buffer_a->mapped || cpu_buffer_b->mapped))
+		return -EBUSY;
 
 	/* At least make sure the two buffers are somewhat the same */
 	if (cpu_buffer_a->nr_pages != cpu_buffer_b->nr_pages)
-		goto out;
+		return -EINVAL;
 
 	if (buffer_a->subbuf_order != buffer_b->subbuf_order)
-		goto out;
-
-	ret = -EAGAIN;
+		return -EINVAL;
 
 	if (atomic_read(&buffer_a->record_disabled))
-		goto out;
+		return -EAGAIN;
 
 	if (atomic_read(&buffer_b->record_disabled))
-		goto out;
+		return -EAGAIN;
 
 	if (atomic_read(&cpu_buffer_a->record_disabled))
-		goto out;
+		return -EAGAIN;
 
 	if (atomic_read(&cpu_buffer_b->record_disabled))
-		goto out;
+		return -EAGAIN;
 
 	/*
 	 * We can't do a synchronize_rcu here because this
@@ -6382,7 +6378,6 @@ int ring_buffer_swap_cpu(struct trace_buffer *buffer_a,
 out_dec:
 	atomic_dec(&cpu_buffer_a->record_disabled);
 	atomic_dec(&cpu_buffer_b->record_disabled);
-out:
 	return ret;
 }
 EXPORT_SYMBOL_GPL(ring_buffer_swap_cpu);