Wrong argument to cs_transpose leads to segfault

[radarsat1]

Quite some time ago I fixed a bug in the Debian package of a segfault randomly happening during testing. At the time I determined that the argument to cs_transpose was incorrect and caused a segfault randomly during testing.

The segfault can be reproduced (without this patch) by setting the random seed in fctst:

diff --git a/src/tests/fctst.c b/src/tests/fctst.c
index 13f34be..0771a57 100644
--- a/src/tests/fctst.c
+++ b/src/tests/fctst.c
@@ -410,6 +410,7 @@ int main (int argc, char **argv)
   int i;
 
   srand ((unsigned int)time (NULL));
+  srand(1591903824);
 
   if (rand () % 2)
   {

Incidentally it's probably not a great idea to have a random number involved in a test.

Anyway, this patch fixes this problem, but I would prefer someone verify the correctness of the fix, as it's rather obscure.

I am now looking at this because I want to update the Siconos package to 4.4.0, but for this we need to have a new fclib release that includes the new functions related to rolling problems.