extcon: Use tab instead of space for indentation

The extcon header file defines the functions which used the mismatched
indentation and used the space on some case. So, this patch clean-up
the indentation in order to improve the readbility.

And this patch changes the return value of extcon_get_extcon_dev()
because of maintaing the same value with extcon_get_edev_by_phandle().
Signed-off-by: Chanwoo Choi <cwchoi00@gmail.com>

include/linux/extcon.h

@@ -355,15 +355,13 @@ static inline int extcon_set_property_capability(struct extcon_dev *edev,
 }
 
 static inline int extcon_register_notifier(struct extcon_dev *edev,
-					unsigned int id,
-					struct notifier_block *nb)
+				unsigned int id, struct notifier_block *nb)
 {
 	return 0;
 }
 
 static inline int extcon_unregister_notifier(struct extcon_dev *edev,
-					unsigned int id,
-					struct notifier_block *nb)
+				unsigned int id, struct notifier_block *nb)
 {
 	return 0;
 }
@@ -381,7 +379,7 @@ static inline  void devm_extcon_unregister_notifier(struct device *dev,
 
 static inline struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
 {
-	return NULL;
+	return ERR_PTR(-ENODEV);
 }
 
 static inline struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
@@ -409,8 +407,7 @@ static inline int extcon_register_interest(struct extcon_specific_cable_nb *obj,
 	return -EINVAL;
 }
 
-static inline int extcon_unregister_interest(struct extcon_specific_cable_nb
-						    *obj)
+static inline int extcon_unregister_interest(struct extcon_specific_cable_nb *obj)
 {
 	return -EINVAL;
 }