powerpc/powernv: Simplify pnv_ioda_configure_pe()

Nested if statements are always bad and the patch avoids one by
checking PHB type and bail in advance if necessary.
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/platforms/powernv/pci-ioda.c

@@ -684,11 +684,14 @@ static int pnv_ioda_configure_pe(struct pnv_phb *phb, struct pnv_ioda_pe *pe)
 		phb->ioda.pe_rmap[rid] = pe->pe_number;
 
 	/* Setup one MVTs on IODA1 */
-	if (phb->type == PNV_PHB_IODA1) {
+	if (phb->type != PNV_PHB_IODA1) {
+		pe->mve_number = 0;
+		goto out;
+	}
+
 	pe->mve_number = pe->pe_number;
-		rc = opal_pci_set_mve(phb->opal_id, pe->mve_number,
-				      pe->pe_number);
-		if (rc) {
+	rc = opal_pci_set_mve(phb->opal_id, pe->mve_number, pe->pe_number);
+	if (rc != OPAL_SUCCESS) {
 		pe_err(pe, "OPAL error %ld setting up MVE %d\n",
 		       rc, pe->mve_number);
 		pe->mve_number = -1;
@@ -701,9 +704,8 @@ static int pnv_ioda_configure_pe(struct pnv_phb *phb, struct pnv_ioda_pe *pe)
 			pe->mve_number = -1;
 		}
 	}
-	} else if (phb->type == PNV_PHB_IODA2)
-		pe->mve_number = 0;
 
+out:
 	return 0;
 }