NTB: Use struct_size() helper in devm_kzalloc()

NTB: Use struct_size() helper in devm_kzalloc()

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes. Also, remove unnecessary
variable _struct_size_.

This code was detected with the help of Coccinelle and, audited and
fixed manually.

Addresses-KSPP-ID: https://github.com/KSPP/linux/issues/83
Signed-off-by: Gustavo A. R. Silva <[email protected]>
Reviewed-by: Logan Gunthorpe <[email protected]>
Signed-off-by: Jon Mason <[email protected]>