Fix bitops.c clang-format properly

[LiiNen]

ref:

• Change BITCOUNT 'end' as optional like BITPOS #118 (my pervious change)
• Make cluster meet reliable under link failures #461 (issuing that clang format checker fails due to my change)

There was an issue that clang-format cheker failed.
I don't know why I missed it and why it didn't catch.

just running clang-format -i bitops.c was all.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.23%. Comparing base (96dcd11) to head (178a821).

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable     #570      +/-   ##
============================================
+ Coverage     70.21%   70.23%   +0.02%     
============================================
  Files           109      109              
  Lines         59956    59956              
============================================
+ Hits          42096    42113      +17     
+ Misses        17860    17843      -17     

Files	Coverage Δ
src/bitops.c	94.18% <100.00%> (ø)

... and 11 files with indirect coverage changes

[PingXie]

Thanks @LiiNen!