Staging: batman-adv: fix function prototype

In today linux-next I got a compile warning in staging/batman-adv.

This is due a struct bin_attribute read function prototype change and the driver was not updated.

This patch solves the issue
Signed-off-by: NJavier Martinez Canillas <martinez.javier@gmail.com>
Signed-off-by: NSven Eckelmann <sven.eckelmann@gmx.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/batman-adv/bat_sysfs.c

@@ -201,7 +201,7 @@ static struct bat_attribute *mesh_attrs[] = {
 	NULL,
 };
 
-static ssize_t transtable_local_read(struct kobject *kobj,
+static ssize_t transtable_local_read(struct file *filp, struct kobject *kobj,
 				  struct bin_attribute *bin_attr,
 				  char *buff, loff_t off, size_t count)
 {
@@ -211,7 +211,7 @@ static ssize_t transtable_local_read(struct kobject *kobj,
 	return hna_local_fill_buffer_text(net_dev, buff, count, off);
 }
 
-static ssize_t transtable_global_read(struct kobject *kobj,
+static ssize_t transtable_global_read(struct file *filp, struct kobject *kobj,
 				  struct bin_attribute *bin_attr,
 				  char *buff, loff_t off, size_t count)
 {
@@ -221,7 +221,7 @@ static ssize_t transtable_global_read(struct kobject *kobj,
 	return hna_global_fill_buffer_text(net_dev, buff, count, off);
 }
 
-static ssize_t originators_read(struct kobject *kobj,
+static ssize_t originators_read(struct file *filp, struct kobject *kobj,
 				  struct bin_attribute *bin_attr,
 				  char *buff, loff_t off, size_t count)
 {
@@ -231,7 +231,7 @@ static ssize_t originators_read(struct kobject *kobj,
 	return orig_fill_buffer_text(net_dev, buff, count, off);
 }
 
-static ssize_t vis_data_read(struct kobject *kobj,
+static ssize_t vis_data_read(struct file *filp, struct kobject *kobj,
 				  struct bin_attribute *bin_attr,
 				  char *buff, loff_t off, size_t count)
 {