[PATCH] PM / wakeup: fix ptr_ret.cocci warnings

[kbuild test robot <lkp@intel.com>]

From: kbuild test robot <lkp@intel.com>

drivers/base/power/wakeup_stats.c:143:1-3: WARNING: PTR_ERR_OR_ZERO can be used


 Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR

Generated by: scripts/coccinelle/api/ptr_ret.cocci

Fixes: 0b050f7fb8a1 ("PM / wakeup: show wakeup sources stats in sysfs")
CC: Tri Vo <trong@android.com>
Signed-off-by: kbuild test robot <lkp@intel.com>
---

tree:   https://kernel.googlesource.com/pub/scm/linux/kernel/git/rafael/linux-pm.git bleeding-edge
head:   14b99dcec44e7bca9f01e042002f57e9f0dda133
commit: 0b050f7fb8a1e45c72ca945bac2821a59d4a0101 [21/23] PM / wakeup: show wakeup sources stats in sysfs

 wakeup_stats.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

--- a/drivers/base/power/wakeup_stats.c
+++ b/drivers/base/power/wakeup_stats.c
@@ -140,10 +140,7 @@ EXPORT_SYMBOL_GPL(wakeup_source_sysfs_re
 static int __init wakeup_sources_sysfs_init(void)
 {
 	wakeup_class = class_create(THIS_MODULE, "wakeup");
-	if (IS_ERR(wakeup_class))
-		return PTR_ERR(wakeup_class);
-
-	return 0;
+	return PTR_ERR_OR_ZERO(wakeup_class);
 }
 
 postcore_initcall(wakeup_sources_sysfs_init);