btrfs-progs: print-tree: remove dead code from btrfs_print_tree

Since the out label has been deleted, this free_extent_buffer will never
be executed.

Fixes: f37ae8d275 ("btrfs-progs: print-tree: Enhance warning on tree block level mismatch and error handling")
Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

print-tree.c

@@ -1458,6 +1458,4 @@ void btrfs_print_tree(struct extent_buffer *eb, int follow)
 	}
 
 	return;
-
-	free_extent_buffer(next);
 }