These are two fixes in [S,C,D,Z]-LAGGE.

These are two fixes in [S,C,D,Z]-LAGGE.

(1) The routine was writing ZEROs out of bound in some specific cases. This is
corrected. Thanks to Yi Meng (CU Denver) for finding the bug.

(2) Quick exit when KL=KU=0 in this case, the user wants a diagonal matrix,
there is probably no reason to call this routine if one simply wants a diagonal
matrix, but that said we still ought to return a correct answer. A quick exit
makes the trick. The routine was not working otherwise.