This patch series optimizes the IO error counting logic of the rtl8723bs wireless
driver by removing redundant atomic_t operations (unnecessary for non-concurrent scenarios) and replacing the global continual_io_error variable with local error counting. The series is split into logical patches (per Greg KH's review comment)
to ensure each patch fulfills a single, clear purpose, which greatly improves
reviewability and future maintainability.

Patch Breakdown:
1. 0001: Add independent rtw_check_continual_io_error function (single responsibility, includes old function cleanup)
2. 0002: Use local error_count in sd_read32/sd_write32 (eliminate global dependency, remove atomic ops)
3. 0003: Remove redundant global continual_io_error variable (clean up struct)

Changelog from v3 to v4:
- Split the monolithic v3 patch into logical, single-purpose patches
- Fixed all coding style errors (trailing spaces, missing assignment spaces, indentation, blank line alignment)
- Added detailed, purpose-driven commit messages for each patch
- Added version changelog as required by kernel documentation
- Added this cover letter to explain the entire patch series
- Optimized the new check function to remove redundant ternary expression (more concise kernel style)

Thank you for your time and review!

Signed-off-by: changjunzheng <guagua210311@qq.com>
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Note: This v4 RESEND patch series is sent from my school mailbox (2023060904@ycu.edu.cn) instead of the previous QQ mailbox, to resolve the email delivery rejection issue.