IB/iser: Simplify prot_caps setting

Reduce the number of instructions made for setting protection caps. No
need to do bitwise OR with 0 since we can zero the return value in the
beginning of the function.

Link: https://lore.kernel.org/r/20210111145754.56727-5-mgurtovoy@nvidia.comReviewed-by: Israel Rukshin <israelr@nvidia.com>
Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/ulp/iser/iscsi_iser.c

@@ -590,13 +590,20 @@ iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
 static inline unsigned int
 iser_dif_prot_caps(int prot_caps)
 {
-	return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ?
-		SHOST_DIF_TYPE1_PROTECTION | SHOST_DIX_TYPE0_PROTECTION |
-		SHOST_DIX_TYPE1_PROTECTION : 0) |
-	       ((prot_caps & IB_PROT_T10DIF_TYPE_2) ?
-		SHOST_DIF_TYPE2_PROTECTION | SHOST_DIX_TYPE2_PROTECTION : 0) |
-	       ((prot_caps & IB_PROT_T10DIF_TYPE_3) ?
-		SHOST_DIF_TYPE3_PROTECTION | SHOST_DIX_TYPE3_PROTECTION : 0);
+	int ret = 0;
+
+	if (prot_caps & IB_PROT_T10DIF_TYPE_1)
+		ret |= SHOST_DIF_TYPE1_PROTECTION |
+		       SHOST_DIX_TYPE0_PROTECTION |
+		       SHOST_DIX_TYPE1_PROTECTION;
+	if (prot_caps & IB_PROT_T10DIF_TYPE_2)
+		ret |= SHOST_DIF_TYPE2_PROTECTION |
+		       SHOST_DIX_TYPE2_PROTECTION;
+	if (prot_caps & IB_PROT_T10DIF_TYPE_3)
+		ret |= SHOST_DIF_TYPE3_PROTECTION |
+		       SHOST_DIX_TYPE3_PROTECTION;
+
+	return ret;
 }
 
 /**