FSYR2K_Upper_NoTrans test failure

[orlitzky]

Original report: https://bugs.gentoo.org/924880

With fflas-ffpack-2.5.0, we have a report of FSYR2K_Upper_NoTrans failing:

Checking with Modular_implem<float, float, uint32_t> modulo 2
Checking FSYR2K_Upper_NoTrans......................Fail at i = 0 j = 0
Fail at i = 0 j = 1
Fail at i = 0 j = 2
Fail at i = 0 j = 3
Fail at i = 0 j = 4
Fail at i = 0 j = 5
Fail at i = 0 j = 6
Fail at i = 0 j = 7
...

The full test log is available here: https://924880.bugs.gentoo.org/attachment.cgi?id=885299

The system it's running on is using musl libc in case that is relevant.