btrfs: remove unused fs_info arg from btrfs_close_extra_devices()

The commit:
8dabb74 Btrfs: change core code of btrfs to support the
        device replace operations
added the fs_info argument, but never used it -
just remove it again.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 6911aa4..d91f089 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2690,7 +2690,7 @@
 	 * keep the device that is marked to be the target device for the
 	 * dev_replace procedure
 	 */
-	btrfs_close_extra_devices(fs_info, fs_devices, 0);
+	btrfs_close_extra_devices(fs_devices, 0);
 
 	if (!fs_devices->latest_bdev) {
 		printk(KERN_ERR "BTRFS: failed to read devices on %s\n",
@@ -2794,7 +2794,7 @@
 		goto fail_block_groups;
 	}
 
-	btrfs_close_extra_devices(fs_info, fs_devices, 1);
+	btrfs_close_extra_devices(fs_devices, 1);
 
 	ret = btrfs_sysfs_add_one(fs_info);
 	if (ret) {
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index d7d1dde..6d4fb24 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -609,8 +609,7 @@
 	return ERR_PTR(-ENOMEM);
 }
 
-void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info,
-			       struct btrfs_fs_devices *fs_devices, int step)
+void btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices, int step)
 {
 	struct btrfs_device *device, *next;
 	struct btrfs_device *latest_dev = NULL;
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 83069de..ebc3133 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -421,8 +421,7 @@
 int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder,
 			  struct btrfs_fs_devices **fs_devices_ret);
 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
-void btrfs_close_extra_devices(struct btrfs_fs_info *fs_info,
-			       struct btrfs_fs_devices *fs_devices, int step);
+void btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices, int step);
 int btrfs_find_device_missing_or_by_path(struct btrfs_root *root,
 					 char *device_path,
 					 struct btrfs_device **device);