block: don't call bio_uninit from bio_endio

Commit b222dd2fdd53 ("block: call bio_uninit in bio_endio") added a call
to bio_uninit in bio_endio to work around callers that use bio_init but
fail to call bio_uninit after they are done to release the resources.
While this is an abuse of the bio_init API we still have quite a few of
those left.  But this early uninit causes a problem for integrity data,
as at least some users need the bio_integrity_payload.  Right now the
only one is the NVMe passthrough which archives this by adding a special
case to skip the freeing if the BIP_INTEGRITY_USER flag is set.

Sort this out by only putting bi_blkg in bio_endio as that is the cause
of the actual leaks - the few users of the crypto context and integrity
data all properly call bio_uninit, usually through bio_put for
dynamically allocated bios.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Martin K. Petersen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

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