Commit 7a03aeb6 ("xprtrdma: Micro-optimize MR DMA-unmapping")
removed the last use of the @r_xprt parameter in this function, but
neglected to remove the parameter itself.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>