btrfs: Remove BUG_ON from __finish_chunk_alloc()

btrfs_alloc_chunk() unconditionally BUGs on any error returned from
__finish_chunk_alloc() so there's no need for two BUG_ON lines. Remove the
one from __finish_chunk_alloc().

Signed-off-by: Mark Fasheh <mfasheh@suse.de>
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index f002973..394bf15 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -3383,7 +3383,8 @@
 		device = map->stripes[index].dev;
 		device->bytes_used += stripe_size;
 		ret = btrfs_update_device(trans, device);
-		BUG_ON(ret);
+		if (ret)
+			goto out_free;
 		index++;
 	}
 
@@ -3430,6 +3431,7 @@
 					     item_size);
 	}
 
+out_free:
 	kfree(chunk);
 	return ret;
 }