staging: lustre: lnet: fill in real lnet_md_t

While checkpatch reported an alignment issue
its just ugly to fill in a data structure being
passed to a function. Instead fill in a lnet_md_t
on the stack and pass that to LNetMDBind.

Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>