qcacmn: Fix variable uninitialized compiler error

Initialize revision_id to avoid compiler error as
'variable may be used uninitialized'.

Change-Id: Ia76b297e0f0f745284c7d0ede72a55dcc3d0dc65
CRs-Fixed: 2350601

hif/src/pcie/if_pci.c

@@ -3713,7 +3713,7 @@ QDF_STATUS hif_pci_enable_bus(struct hif_softc *ol_sc,
 	uint32_t hif_type, target_type;
 	struct hif_pci_softc *sc = HIF_GET_PCI_SOFTC(ol_sc);
 	struct hif_opaque_softc *hif_hdl = GET_HIF_OPAQUE_HDL(ol_sc);
-	uint16_t revision_id;
+	uint16_t revision_id = 0;
 	int probe_again = 0;
 	struct pci_dev *pdev = bdev;
 	const struct pci_device_id *id = (const struct pci_device_id *)bid;