Revert "block: Warn and free bio if bi_end_io is not set"
Revert "block: Warn and free bio if bi_end_io is not set"

This reverts commit 95d4403889acbd98e06d41a255df76452210996a.

The patch is broken for on-stack bios, amongst other things.

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs