trace: code style clean up

Ingo Molnar suggested using goto logic to keep the indentation
down and to be able to remove the nasty line breaks. This actually
makes the code a bit more readable.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

kernel/trace/trace.c

@@ -522,23 +522,24 @@ int register_tracer(struct tracer *type)
 	tracing_selftest_running = false;
 	mutex_unlock(&trace_types_lock);
 
-	if (!ret && default_bootup_tracer) {
-		if (!strncmp(default_bootup_tracer, type->name,
-			     BOOTUP_TRACER_SIZE)) {
-			printk(KERN_INFO "Starting tracer '%s'\n",
-			       type->name);
-			/* Do we want this tracer to start on bootup? */
-			tracing_set_tracer(type->name);
-			default_bootup_tracer = NULL;
-			/* disable other selftests, since this will break it. */
-			tracing_selftest_disabled = 1;
+	if (ret || !default_bootup_tracer)
+		goto out_unlock;
+
+	if (strncmp(default_bootup_tracer, type->name, BOOTUP_TRACER_SIZE))
+		goto out_unlock;
+
+	printk(KERN_INFO "Starting tracer '%s'\n", type->name);
+	/* Do we want this tracer to start on bootup? */
+	tracing_set_tracer(type->name);
+	default_bootup_tracer = NULL;
+	/* disable other selftests, since this will break it. */
+	tracing_selftest_disabled = 1;
 #ifdef CONFIG_FTRACE_STARTUP_TEST
-			printk(KERN_INFO "Disabling FTRACE selftests due"
-			       " to running tracer '%s'\n", type->name);
+	printk(KERN_INFO "Disabling FTRACE selftests due to running tracer '%s'\n",
+	       type->name);
 #endif
-		}
-	}
 
+ out_unlock:
 	lock_kernel();
 	return ret;
 }