staging: rdma: hfi1: Remove unnecessary parantheses

Removed parantheses on the right hand side of assignments as they are not
needed. Coccinelle patch used:

@@ expression a, b; @@

a = &
-(
b
-)

Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>