cfg80211: no need to check return value of debugfs_create functions

When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20190703070142.GA29993@kroah.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/core.c

@@ -142,12 +142,10 @@ int cfg80211_dev_rename(struct cfg80211_registered_device *rdev,
 	if (result)
 		return result;
 
-	if (rdev->wiphy.debugfsdir &&
-	    !debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
-			    rdev->wiphy.debugfsdir,
-			    rdev->wiphy.debugfsdir->d_parent,
-			    newname))
-		pr_err("failed to rename debugfs dir to %s!\n", newname);
+	if (rdev->wiphy.debugfsdir)
+		debugfs_rename(rdev->wiphy.debugfsdir->d_parent,
+			       rdev->wiphy.debugfsdir,
+			       rdev->wiphy.debugfsdir->d_parent, newname);
 
 	nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);
 
@@ -899,11 +897,8 @@ int wiphy_register(struct wiphy *wiphy)
 	cfg80211_rdev_list_generation++;
 
 	/* add to debugfs */
-	rdev->wiphy.debugfsdir =
-		debugfs_create_dir(wiphy_name(&rdev->wiphy),
-				   ieee80211_debugfs_dir);
-	if (IS_ERR(rdev->wiphy.debugfsdir))
-		rdev->wiphy.debugfsdir = NULL;
+	rdev->wiphy.debugfsdir = debugfs_create_dir(wiphy_name(&rdev->wiphy),
+						    ieee80211_debugfs_dir);
 
 	cfg80211_debugfs_rdev_add(rdev);
 	nl80211_notify_wiphy(rdev, NL80211_CMD_NEW_WIPHY);