Fixes tags need work in the block tree

[Mark Brown]

In commit

  7a9ffcf2cbf88 ("io_uring/zcrx: use dma_len for chunk size calculation")

Fixes tag

  Fixes: 8c0cab0b7bf76 ("always dma map in advance")

has these problem(s):

  - Subject does not match target commit subject
    Just use
	git log -1 --format='Fixes: %h ("%s")'

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