v3.0.x: usnic: ensure to set the iov_limit to 1#3391

hppritcha merged 2 commits intoopen-mpi:v3.xopen-mpi/ompi:v3.xfrom

jsquyres:pr/v3.0.x/usnic-fix-iov-lenjsquyres/ompi:pr/v3.0.x/usnic-fix-iov-lenCopy head branch name to clipboard