block: Check for inserted BlockDriverState in blk_io_limits_disable()

block: Check for inserted BlockDriverState in blk_io_limits_disable()

When you set I/O limits using block_set_io_throttle or the command
line throttling.* options they are kept in the BlockBackend regardless
of whether a BlockDriverState is attached to the backend or not.

Therefore when removing the limits using blk_io_limits_disable() we
need to check if there's a BDS before attempting to drain it, else it
will crash QEMU. This can be reproduced very easily using HMP:

     (qemu) drive_add 0 if=none,throttling.iops-total=5000
     (qemu) drive_del none0

Reported-by: sochin jiang <[email protected]>
Signed-off-by: Alberto Garcia <[email protected]>
Reviewed-by: Max Reitz <[email protected]>
Message-id: 0d3a67ce8d948bb33e08672564714dcfb76a3d8c.1510339534[email protected]
Signed-off-by: Stefan Hajnoczi <[email protected]>