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[Lapack] a possible but in ?tgsen

And Daniel Waggoner writes:
I am using LAPACK 3.2.  I have found that the routine dtgsen() 
occasionally crashes.  Upon further investigation, on line 704 of 
dtgsen.f, it appears that the matrix Q is referenced even if WANTQ is 
false.  I suspect that there should be an if statement and that Q should
only be changed only if WANTQ is true.

Committed that fix, thanks!

Jason

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