Fix typo in EXTERNAL declaration
ZHBTRD_HB2ST  should be ZHETRD_HB2ST
* ..
* .. External Subroutines ..
EXTERNAL DLASUM, XERBLA, ZHBT21, ZHBTRD, ZLACPY, ZLASET,
- $ ZLATMR, ZLATMS, ZHBTRD_HB2ST, ZSTEQR
+ $ ZLATMR, ZLATMS, ZHETRD_HB2ST, ZSTEQR
* ..
* .. Intrinsic Functions ..
INTRINSIC ABS, DBLE, DCONJG, MAX, MIN, SQRT
