IB/ehca: Return proper error code if register_mr fails

Set the return code of ehca_register_mr() to ENOMEM if the corresponding
firmware call fails due to out of resources.  Some other error codes
were explicitly mapped to EINVAL -- just remove those cases so they
get mapped to the default case, which already returns EINVAL anyway.
Signed-off-by: Hoang-Nam Nguyen <hnguyen@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/ehca/ehca_mrmw.c

@@ -2050,13 +2050,10 @@ int ehca_mrmw_map_hrc_alloc(const u64 hipz_rc)
 	switch (hipz_rc) {
 	case H_SUCCESS:	             /* successful completion */
 		return 0;
-	case H_ADAPTER_PARM:         /* invalid adapter handle */
-	case H_RT_PARM:              /* invalid resource type */
 	case H_NOT_ENOUGH_RESOURCES: /* insufficient resources */
-	case H_MLENGTH_PARM:         /* invalid memory length */
-	case H_MEM_ACCESS_PARM:      /* invalid access controls */
 	case H_CONSTRAINED:          /* resource constraint */
-		return -EINVAL;
+	case H_NO_MEM:
+		return -ENOMEM;
 	case H_BUSY:                 /* long busy */
 		return -EBUSY;
 	default: