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Gilles Gouaillardet 79a737ca94 mpi/c: fix param checks in [I]Neighbor_alltoall{v,w}
do not check some input parameters when an {in,out}degree is zero

Thanks Junchao Zhang for analyzing and reporting this issue.

Signed-off-by: Gilles Gouaillardet <gilles@rist.or.jp>
(cherry picked from commit 5655d64bd3e064cdd6925b994e555e75d00d0f08)
2020-07-10 16:58:52 -06:00
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