cpufreq: amd-pstate: Don't create attributes when registration fails

If driver registration fails then immediately return the failure
instead of continuing to register attributes.

This fixes issues of falling back from amd-pstate to other drivers
when cpufreq init has failed for any reason.

Reported-by: alex.s.cochran@proton.me
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Reviewed-by: Perry Yuan <Perry.Yuan@amd.com>
Link: https://lore.kernel.org/r/20240623200918.52104-1-mario.limonciello@amd.com
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>

drivers/cpufreq/amd-pstate.c

@@ -1863,8 +1863,10 @@ static int __init amd_pstate_init(void)
 	}
 
 	ret = cpufreq_register_driver(current_pstate_driver);
-	if (ret)
+	if (ret) {
 		pr_err("failed to register with return %d\n", ret);
+		goto disable_driver;
+	}
 
 	dev_root = bus_get_dev_root(&cpu_subsys);
 	if (dev_root) {
@@ -1880,6 +1882,8 @@ static int __init amd_pstate_init(void)
 
 global_attr_free:
 	cpufreq_unregister_driver(current_pstate_driver);
+disable_driver:
+	amd_pstate_enable(false);
 	return ret;
 }
 device_initcall(amd_pstate_init);