object: fix verify checksum

[zhijian-pro]

close #4210

[codecov]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (52d7c7d) 55.56% compared to head (7bb3bd3) 55.61%.
Report is 3 commits behind head on main.

Files	Patch %	Lines
pkg/object/oss.go	0.00%	7 Missing ⚠️
pkg/object/cos.go	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4213      +/-   ##
==========================================
+ Coverage   55.56%   55.61%   +0.04%     
==========================================
  Files         154      154              
  Lines       39492    39531      +39     
==========================================
+ Hits        21944    21985      +41     
+ Misses      15094    15087       -7     
- Partials     2454     2459       +5     

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