Fix bugs on Raising Assertion Error on Test Module

[shinae-woo]

No description provided.

[codecov]

Codecov Report

Merging #677 into master will increase coverage by 0.07%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #677      +/-   ##
==========================================
+ Coverage   69.66%   69.73%   +0.07%     
==========================================
  Files         212      212              
  Lines       13725    13695      -30     
==========================================
- Hits         9561     9550      -11     
+ Misses       4164     4145      -19

Impacted Files	Coverage Δ
bessctl/test_utils.py	20.64% <0%> (ø)	⬆️
core/modules/source.cc	75.67% <0%> (-0.65%)	⬇️
core/utils/simd.h	100% <0%> (ø)	⬆️
core/modules/flowgen.cc	74.07% <0%> (+0.37%)	⬆️
core/utils/checksum.h	95.86% <0%> (+2.29%)	⬆️
core/utils/copy.h	75% <0%> (+13.23%)	⬆️

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[sangjinhan]

Thanks!