btrfs: btrfs_abort_transaction, drop root parameter

__btrfs_abort_transaction doesn't use its root parameter except to
obtain an fs_info pointer.  We can obtain that from trans->root->fs_info
for now and from trans->fs_info in a later patch.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 48b9490..9404121 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -950,7 +950,7 @@
 			ret = btrfs_del_items(trans, root, path, del_slot,
 					      del_nr);
 			if (ret) {
-				btrfs_abort_transaction(trans, root, ret);
+				btrfs_abort_transaction(trans, ret);
 				break;
 			}
 
@@ -974,7 +974,7 @@
 		path->slots[0] = del_slot;
 		ret = btrfs_del_items(trans, root, path, del_slot, del_nr);
 		if (ret)
-			btrfs_abort_transaction(trans, root, ret);
+			btrfs_abort_transaction(trans, ret);
 	}
 
 	leaf = path->nodes[0];
@@ -1190,7 +1190,7 @@
 			goto again;
 		}
 		if (ret < 0) {
-			btrfs_abort_transaction(trans, root, ret);
+			btrfs_abort_transaction(trans, ret);
 			goto out;
 		}
 
@@ -1278,7 +1278,7 @@
 
 		ret = btrfs_del_items(trans, root, path, del_slot, del_nr);
 		if (ret < 0) {
-			btrfs_abort_transaction(trans, root, ret);
+			btrfs_abort_transaction(trans, ret);
 			goto out;
 		}
 	}