Backport of 11302 to branches/4.1.x:

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r11302 | dstrubbe | 2013-10-08 18:10:46 -0400 (Tue, 08 Oct 2013) | 3 lines

* Minor bugfix to r7250: the sanity check for parallelization gives misleading information when there are slaves, since real_group_sizes is compared to the total number of MPI tasks in the output, whereas the error condition is flagged when mc%group_sizes and MPI tasks do not match.
* Typo.

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