Merge #9598: Improve readability by removing redundant casts to same type (on…
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Description

Merge #9598: Improve readability by removing redundant casts to same type (on all platforms)

Summary:
06edc23f7 Improve readability by removing redundant casts to same type (on all platforms) (practicalswift)

Pull request description:

Same binaries check under Linux:

```
$ ../bitcoin-maintainer-tools/build-for-compare.py 874f13821f4193bd037cd37d005ee76b5a849398 82274c02ed2d82537dc55f008a29edb1bc09bbc4 --executables "src/bitcoind,src/bitcoin-cli,src/bitcoin-tx"

$ sha256sum /tmp/compare/*.stripped
1fe1a8827474f7f24475ce3dc851e7ac658d4ed0ae38d11e67f5a810671eaa15  /tmp/compare/bitcoin-cli.82274c02ed2d82537dc55f008a29edb1bc09bbc4.stripped
1fe1a8827474f7f24475ce3dc851e7ac658d4ed0ae38d11e67f5a810671eaa15  /tmp/compare/bitcoin-cli.874f13821f4193bd037cd37d005ee76b5a849398.stripped
342c2ed0e60b60990a58cbf5845b256a4f9e3baff9db074baba5e34a620a60ea  /tmp/compare/bitcoind.82274c02ed2d82537dc55f008a29edb1bc09bbc4.stripped
342c2ed0e60b60990a58cbf5845b256a4f9e3baff9db074baba5e34a620a60ea  /tmp/compare/bitcoind.874f13821f4193bd037cd37d005ee76b5a849398.stripped
e4b2a80b2361d5cefd67a47eeb9298b8b712c26c7779d979348be8b2c7e3ec93  /tmp/compare/bitcoin-tx.82274c02ed2d82537dc55f008a29edb1bc09bbc4.stripped
e4b2a80b2361d5cefd67a47eeb9298b8b712c26c7779d979348be8b2c7e3ec93  /tmp/compare/bitcoin-tx.874f13821f4193bd037cd37d005ee76b5a849398.stripped

$ git diff -W --word-diff /tmp/compare/874f13821f4193bd037cd37d005ee76b5a849398 /tmp/compare/82274c02ed2d82537dc55f008a29edb1bc09bbc4

$
```

Tree-SHA512: 13ca5862fbb03771682b04a7523e581a7fe62e73620fa0e141cf1bc0a3b3f4e2e66bf14b46d1228e2b11b4960153545e7476f3295713a69b5cf5a28a7c2b358d

Backport of Core PR9598
https://github.com/bitcoin/bitcoin/pull/9598/

Test Plan: