malloc(0) in MPI_Unpublish_name() with MPI_INFO_NULL

[dalcinl]

This is with v2.1.1

>>> from mpi4py import MPI
>>> port = MPI.Open_port()
>>> MPI.Publish_name("service", port)  # info defaults to MPI.INFO_NULL
>>> MPI.Unpublish_name("service", port)  # info defaults to MPI.INFO_NULL
malloc debug: Request for 0 bytes (pmix1_client.c, 849)
>>> MPI.Close_port(port)
>>> 

The offending line (in master) is here:

ompi/opal/mca/pmix/ext1x/pmix1x_client.c

Line 862 in 2f11d37

PMIX_INFO_CREATE(pinfo, ninfo);