btrfs: ensure we don't overrun devices_info[] in __btrfs_alloc_chunk
WARN_ON isn't enough, we need to stop the loop if for any reason
we would overrun the devices_info array.
I tried to track down the connection between the length of
the alloc_devices list and the rw_devices counter but
it wasn't immediately obvious, so be defensive about it.
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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