Bug in comments on array size reported by a Sergey Kuznetsov from Intel.

The size of array RWORK in {c,z}dbsqr was given incorrectly.

Previous version for cbdsqr.f read
          RWORK is REAL array, dimension (2*N)
          if NCVT = NRU = NCC = 0, (max(1, 4*N-4)) otherwise

Now reads
          RWORK is REAL array, dimension (4*N)



git-svn-id: https://icl.cs.utk.edu/svn/lapack-dev/lapack/trunk@1484 8a072113-8704-0410-8d35-dd094bca7971