dma: at_hdmac: correct incompatible type for argument 1 of 'spin_lock_bh'

Correct a typo error in locking calls.

Cc: <stable@kernel.org>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
1 file changed