extcon: Remove unneeded extern keyword from extcon-provider.h

The commit tb7365587 ("extcon: Remove unneeded extern keyword
from extcon.h") removes the unneeded extern keyword from extcon header
file. But, The commit tb7365587 has missed that deletes 'extern'
keyword from extcon-provider.h. So that it deletes extern keyword
from extcon-provider.h.
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Link: https://lore.kernel.org/r/20200217104728.29330-1-cw00.choi@samsung.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/extcon-provider.h

@@ -17,30 +17,30 @@ struct extcon_dev;
 #if IS_ENABLED(CONFIG_EXTCON)
 
 /* Following APIs register/unregister the extcon device. */
-extern int extcon_dev_register(struct extcon_dev *edev);
-extern void extcon_dev_unregister(struct extcon_dev *edev);
-extern int devm_extcon_dev_register(struct device *dev,
+int extcon_dev_register(struct extcon_dev *edev);
+void extcon_dev_unregister(struct extcon_dev *edev);
+int devm_extcon_dev_register(struct device *dev,
 				struct extcon_dev *edev);
-extern void devm_extcon_dev_unregister(struct device *dev,
+void devm_extcon_dev_unregister(struct device *dev,
 				struct extcon_dev *edev);
 
 /* Following APIs allocate/free the memory of the extcon device. */
-extern struct extcon_dev *extcon_dev_allocate(const unsigned int *cable);
-extern void extcon_dev_free(struct extcon_dev *edev);
-extern struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
+struct extcon_dev *extcon_dev_allocate(const unsigned int *cable);
+void extcon_dev_free(struct extcon_dev *edev);
+struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
 				const unsigned int *cable);
-extern void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev);
+void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev);
 
 /* Synchronize the state and property value for each external connector. */
-extern int extcon_sync(struct extcon_dev *edev, unsigned int id);
+int extcon_sync(struct extcon_dev *edev, unsigned int id);
 
 /*
  * Following APIs set the connected state of each external connector.
  * The 'id' argument indicates the defined external connector.
  */
-extern int extcon_set_state(struct extcon_dev *edev, unsigned int id,
+int extcon_set_state(struct extcon_dev *edev, unsigned int id,
 				bool state);
-extern int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id,
+int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id,
 				bool state);
 
 /*
@@ -52,13 +52,13 @@ extern int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id,
  * for each external connector. They are used to set the capability of the
  * property of each external connector based on the id and property.
  */
-extern int extcon_set_property(struct extcon_dev *edev, unsigned int id,
+int extcon_set_property(struct extcon_dev *edev, unsigned int id,
 				unsigned int prop,
 				union extcon_property_value prop_val);
-extern int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id,
+int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id,
 				unsigned int prop,
 				union extcon_property_value prop_val);
-extern int extcon_set_property_capability(struct extcon_dev *edev,
+int extcon_set_property_capability(struct extcon_dev *edev,
 				unsigned int id, unsigned int prop);
 
 #else /* CONFIG_EXTCON */