Improve fix for lapack-test EIG/cchkhb2stg from PR 2778 - #2823
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as explained by serguei-patchkovskii in Reference-LAPACK/lapack#438 (comment) , passing in an index of 1 instead of N leads to a standards violation accessing matrix A in SLASET, i.e. undefined behavior
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as explained by serguei-patchkovskii in Reference-LAPACK/lapack#438 (comment) , passing in an index of 1 instead of N will probably appear to work in practice but actually leads to a standards violation accessing matrix A in SLASET, i.e. undefined behavior