resolve "Multiplication result converted to larger type"

[njzjz]

Follow up #3149.

[codecov]

Codecov Report

Attention: 17 lines in your changes are missing coverage. Please review.

Comparison is base (8c1b467) 76.05% compared to head (14d5e92) 76.06%.

Files	Patch %	Lines
source/api_c/include/deepmd.hpp	68.00%	7 Missing and 1 partial ⚠️
source/op/prod_virial_grad.cc	0.00%	2 Missing ⚠️
source/op/soft_min_virial_grad.cc	0.00%	2 Missing ⚠️
source/op/prod_force_grad.cc	0.00%	1 Missing ⚠️
source/op/prod_force_se_a_mask_grad.cc	0.00%	1 Missing ⚠️
source/op/prod_virial.cc	0.00%	1 Missing ⚠️
source/op/soft_min_force_grad.cc	0.00%	1 Missing ⚠️
source/op/soft_min_virial.cc	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #3159      +/-   ##
==========================================
+ Coverage   76.05%   76.06%   +0.01%     
==========================================
  Files         276      276              
  Lines       25586    25601      +15     
  Branches     1591     1591              
==========================================
+ Hits        19460    19474      +14     
- Misses       5202     5203       +1     
  Partials      924      924              

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