In _correct_ programs only when (group->grp_proc_count - n) > 0,
we may fill ranks_included (callers of ompi_group_excl make sure)...
Therefore move the ranks_included loop into the true
block of the if (which is changed from "!= 0" to ">0").
Otherwise, the initilization of k=0 and ranks_included=NULL is good
for the ompi_group_incl (and submethods ompi_group_*).
Tested on Linux w/ mpi_test_suite and MPIch testsuite:
4 grouptest_coll
4 groupcreate
4 grouptest
This commit was SVN r21172.