Remove comparison as these conditions are never true

[schnorr]

Description
The problem is that dtpmqrt is impossible to use because side must be either l (L) or r (R). The condition not only uses LAPACKE_lsame to compare against the possible values, but also compare the boolean result against side (which is a char). This situation ultimately leads to a logical expression that will never be true, making it impossible to use dtpmqrt and others routines affected by similar code. The commit simply removes side == as this fix the problem.

Checklist

• The documentation has been updated.
  • No documentation change required as in previous version it was OK
• If the PR solves a specific issue, it is set to be closed on merge.
  • No issues found describing this problem

[martin-frbg]

looks like these comparisons came in with #540 @weslleyspereira