drivers: net: xgene: Pre-initialize ret in xgene_enet_get_resources()

If CONFIG_ACPI=n:

drivers/net/ethernet/apm/xgene/xgene_enet_main.c: In function ‘xgene_enet_get_resources’:
drivers/net/ethernet/apm/xgene/xgene_enet_main.c:951: warning: ‘ret’ may be used uninitialized in this function

If the driver is bound to a legacy platform device, ret will contain
arbitrary data. If it is non-zero, it will be returned to the caller as
an error code.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/apm/xgene/xgene_enet_main.c

···
 	struct resource *res;
 	void __iomem *base_addr;
 	u32 offset;
-	int ret;
+	int ret = 0;
 
 	pdev = pdata->pdev;
 	dev = &pdev->dev;