gh-155074: Fix remaining-space calculation in _pyio.BufferedReader.readinto()
#285491
| Job | Run time |
|---|---|
| 6s | |
| 6s | |
| 12s |
_pyio.BufferedReader.readinto()
#285491
| Job | Run time |
|---|---|
| 6s | |
| 6s | |
| 12s |