[Bug-gsl] redundant checks in triangle_selection_fails

[Håkan Johansson]

In bzr trunk, the function triangle_selection_fails in specfunc/coupling.c 
has grown a number of redundant tests since v1.15.  It is enough to check 
the triangle condition for one spin vs the other two.  (See attached test 
program.)  Perhaps put a comment to keep the function lean?

Cheers,
Håkan Johansson

triangle.c
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