Commits on Dec 30, 2020

1. cipher: revert SeekNum::from_block_byte change …

   This reverts the implementation of `SeekNum::from_block_byte` which was
   merged as part of #435.
   
   I'm not exactly sure what the issue is and it's somewhat difficult to
   debug in that it's code that involves both generics and macros causing
   an error as part of any failure in a long chain of checked arithmetic,
   which I'm trying to debug from the context of a concrete stream cipher
   impl (both `chacha20` and `salsa20`) where it's operating over a generic
   type.
   
   The error manifests as `OverflowError`:
   
   RustCrypto/stream-ciphers#205 (comment)
   
   This commit reverts to the previous implementation, which is at least
   much simpler.

   

   tarcieri committed Dec 30, 2020
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