firewire: core: fix crash in iso resource management
This fixes a regression due to post 2.6.30 commit "firewire: core: do not DMA-map stack addresses" 6fdc0370. As David Moore noted, a previously correct sizeof() expression became wrong since the commit changed its argument from an array to a pointer. This resulted in an oops in ohci_cancel_packet in the shared workqueue thread's context when an isochronous resource was to be freed. Reported-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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