net: designware: fix uninitialized phy_addr usage

When CONFIG_DW_SEARCH_PHY is disabled, the local phy_addr variable
never gets initialized which causes random behavior at runtime and a
gcc warning.  So set it by default to the stored phy address.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Reviewed-by: Vipin Kumar <vipin.kumar@st.com>

Fix commit message.
Signed-off-by: Wolfgang Denk <wd@denx.de>

drivers/net/designware.c

@@ -383,6 +383,8 @@ static int configure_phy(struct eth_device *dev)
 		priv->address = phy_addr;
 	else
 		return -1;
+#else
+	phy_addr = priv->address;
 #endif
 	if (dw_reset_phy(dev) < 0)
 		return -1;