Thanks to Lawrence Mulholland (NAG) for reporting the problem. While the array

Thanks to Lawrence Mulholland (NAG) for reporting the problem.  While the array
E should really be of size N-1, xSYCONV() is not ready for this and so, in the
comment at the header level, we now require E to be of size N. Also xSYTRS2()
is using E(N) = ZERO, so if we make E of size N-1 in xSYCONV(), then we need to
see the impact on xSYTRS2().  This is long term cleaning, so for now, we revert
back to requesting an array E of size N. Thanks Lawrence for noticing this.