IB/ehca: Drop unnecessary NULL test

list_for_each_entry binds its first argument to a non-null value, and thus
any null test on the value of that argument is superfluous.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
iterator I;
expression x;
statement S,S1,S2;
@@

I(x,...) { <...
- if (x == NULL && ...) S
  ...> }
// </smpl>
Signed-off-by: NJulia Lawall <julia@diku.dk>
Acked-by: NAlexander Schmidt <alexs@linux.vnet.ibm.com>
Signed-off-by: NRoland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/ehca/ehca_mrmw.c

@@ -933,11 +933,6 @@ int ehca_unmap_fmr(struct list_head *fmr_list)
 	/* check all FMR belong to same SHCA, and check internal flag */
 	list_for_each_entry(ib_fmr, fmr_list, list) {
 		prev_shca = shca;
-		if (!ib_fmr) {
-			ehca_gen_err("bad fmr=%p in list", ib_fmr);
-			ret = -EINVAL;
-			goto unmap_fmr_exit0;
-		}
 		shca = container_of(ib_fmr->device, struct ehca_shca,
 				    ib_device);
 		e_fmr = container_of(ib_fmr, struct ehca_mr, ib.ib_fmr);