Move initialization of destination buffer into check_redist.

tests/test_redist_collection.c

tests/test_redist_collection_static.c

tests/test_redist_common.c

tests/test_redist_common.h

tests/test_redist_p2p.c

tests/test_redist_p2p_parallel.c

tests/test_redist_repeat.c

tests/test_redist_single_array_base.c

tests/test_redist_single_array_base_parallel.c