On error we can call __free_cpu_buffers with only some buffers allocated.
I was getting a bunch of vfree warnings when I hit it, we should check
before calling vfree.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>