From 67b7859e9bfa0dcee5a8256932e393e98739be1b Mon Sep 17 00:00:00 2001
From: Omar Sandoval <osandov@osandov.com>
Date: Tue, 24 Feb 2015 02:47:04 -0800
Subject: [PATCH] btrfs: handle ENOMEM in btrfs_alloc_tree_block

This is one of the first places to give out when memory is tight. Handle
it properly rather than with a BUG_ON.

Also fix the comment about the return value, which is an ERR_PTR, not
NULL, on error.

Signed-off-by: Omar Sandoval <osandov@osandov.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
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Reading git-format-patch failed