RDMA/nes: Pass correct size to ioremap_nocache()

The size argument to ioremap_nocache should be the size of desired
information, not the pointer to it.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@expression@
expression *x;
@@

x =
 <+...
*sizeof(x)
...+>// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Acked-by: Chien Tung <chien.tin.tung@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>