RDMA: Fix a typo

s/struture/structure/

Link: https://lore.kernel.org/r/20210322064322.3933985-1-unixbhaskar@gmail.com


Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>