bugfix for matmul bug (split 10)

[coquelin77]

Matmul had a bug for when kB (the inner blocking dimension is 1, when this was the case, it would do a second loop which would re-add previous results to the result array.

Description

matmul of 2 vectors is handled as an early out
in split 10 case for matmul, the remainder handling does not run if kB is equal to 0

Issue/s resolved: #570

Changes proposed:

• see description

Type of change

• Bug fix (non-breaking change which fixes an issue)

Due Diligence

• All split configurations tested
• Multiple dtypes tested in relevant functions
• Documentation updated (if needed)
• Updated changelog.md under the title "Pending Additions"

Does this change modify the behaviour of other functions? If so, which?

no

[codecov]

Codecov Report

Merging #573 into master will increase coverage by 0.00%.
The diff coverage is 39.28%.

@@           Coverage Diff           @@
##           master     #573   +/-   ##
=======================================
  Coverage   96.46%   96.46%           
=======================================
  Files          75       75           
  Lines       15143    15145    +2     
=======================================
+ Hits        14608    14610    +2     
  Misses        535      535           

Impacted Files	Coverage Δ
heat/core/linalg/solver.py	68.36% <ø> (ø)
heat/core/linalg/basics.py	93.67% <39.28%> (+0.02%)	⬆️

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[coquelin77]

codecov patch is failing but i cannot see why. however, the full coverage is hopefully fine.

[d1saster]

Looks good to me. Thx for fixing the issue :)