Remove potential memory leak in ELPA

Andreas Gloess informed us about a memory leak in ELPA, which was
introduced in version 2013.11.008.

This memory leak is removed now again.

Note, that older versions of ELPA will not be fixed right now.

src/elpa2.F90

@@ -1729,9 +1729,9 @@ subroutine tridiag_band_real(na, nb, nblk, a, lda, d, e, mpi_comm_rows, mpi_comm
 
            if (iblk==nblocks) then
 #ifdef WITH_OPENMP
-             call mpi_wait(ireq_hv,MPI_STATUS_IGNORE,mpierr)
+             call mpi_wait(ireq_hv,MPI_STATUS,mpierr)
 #else
-             call mpi_wait(ireq_ab,MPI_STATUS_IGNORE,mpierr)
+             call mpi_wait(ireq_hv,MPI_STATUS_IGNORE,mpierr)
 #endif
              hv_s(1) = tau_new
              hv_s(2:) = hv_new(2:)