staging: lustre: drop *_t from end of struct lnet_text_buf

When lnet_text_buf data structure was transform from typedef
to struct the *_t which is typical of typedef was not drop.
This patch removes the *_t to be consistent.

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