async-tx: fix buffer submission error handling in ipu_idma.c
If submitting new buffer failed, a wrong descriptor gets completed and it doesn't check, if a callback is at all defined, which can lead to an Oops. Fix these bugs and make ipu_update_channel_buffer() void, because it never fails. Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: NDan Williams <dan.j.williams@intel.com>
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