Avoid out-of-bounds accesses in complex EIG tests

[martin-frbg]

fixes #333

[codecov]

Codecov Report

Merging #338 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #338   +/-   ##
=======================================
  Coverage   81.66%   81.66%           
=======================================
  Files        1847     1847           
  Lines      180341   180341           
=======================================
  Hits       147267   147267           
  Misses      33074    33074

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[codecov]

Codecov Report

Merging #338 into master will increase coverage by 1.58%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #338      +/-   ##
==========================================
+ Coverage   81.66%   83.24%   +1.58%     
==========================================
  Files        1847     1808      -39     
  Lines      180341   170181   -10160     
==========================================
- Hits       147267   141664    -5603     
+ Misses      33074    28517    -4557

Impacted Files	Coverage Δ
SRC/dlat2s.f	76.47% <0%> (-4.49%)	⬇️
SRC/dtgexc.f	46.35% <0%> (-3.98%)	⬇️
SRC/dlansb.f	62.5% <0%> (-3.29%)	⬇️
SRC/slansb.f	62.5% <0%> (-3.29%)	⬇️
SRC/clansy.f	65.51% <0%> (-3.06%)	⬇️
SRC/zlansy.f	65.51% <0%> (-3.06%)	⬇️
SRC/slangb.f	72.5% <0%> (-3.02%)	⬇️
SRC/dlangb.f	72.5% <0%> (-3.02%)	⬇️
SRC/clangb.f	72.5% <0%> (-3.02%)	⬇️
SRC/zlangb.f	72.5% <0%> (-3.02%)	⬇️
... and 1202 more

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