Remove unused zero computations in default_blasmul

[jishnub]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.52%. Comparing base (0690818) to head (cca276a).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #258      +/-   ##
==========================================
- Coverage   89.58%   89.52%   -0.07%     
==========================================
  Files          11       11              
  Lines        1930     1938       +8     
==========================================
+ Hits         1729     1735       +6     
- Misses        201      203       +2     

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