btrfs: drop unused argument in btrfs_ioctl_get_supported_features

Reviewed-by: NAnand Jain <anand.jain@oracle.com>
Signed-off-by: NDavid Sterba <dsterba@suse.com>

fs/btrfs/ctree.h

@@ -4089,7 +4089,7 @@ void btrfs_test_inode_set_ops(struct inode *inode);
 
 /* ioctl.c */
 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
-int btrfs_ioctl_get_supported_features(struct file *file, void __user *arg);
+int btrfs_ioctl_get_supported_features(void __user *arg);
 void btrfs_update_iflags(struct inode *inode);
 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
 int btrfs_is_empty_uuid(u8 *uuid);

fs/btrfs/ioctl.c

@@ -5187,7 +5187,7 @@ static int btrfs_ioctl_set_fslabel(struct file *file, void __user *arg)
 	  .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
 	  .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
 
-int btrfs_ioctl_get_supported_features(struct file *file, void __user *arg)
+int btrfs_ioctl_get_supported_features(void __user *arg)
 {
 	static const struct btrfs_ioctl_feature_flags features[3] = {
 		INIT_FEATURE_FLAGS(SUPP),
@@ -5466,7 +5466,7 @@ long btrfs_ioctl(struct file *file, unsigned int
 	case BTRFS_IOC_SET_FSLABEL:
 		return btrfs_ioctl_set_fslabel(file, argp);
 	case BTRFS_IOC_GET_SUPPORTED_FEATURES:
-		return btrfs_ioctl_get_supported_features(file, argp);
+		return btrfs_ioctl_get_supported_features(argp);
 	case BTRFS_IOC_GET_FEATURES:
 		return btrfs_ioctl_get_features(file, argp);
 	case BTRFS_IOC_SET_FEATURES:

fs/btrfs/super.c

@@ -2164,8 +2164,7 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd,
 		ret = !(fs_devices->num_devices == fs_devices->total_devices);
 		break;
 	case BTRFS_IOC_GET_SUPPORTED_FEATURES:
-		ret = btrfs_ioctl_get_supported_features(NULL,
-				(void __user*)arg);
+		ret = btrfs_ioctl_get_supported_features((void __user*)arg);
 		break;
 	}