usb: phy: generic: fix a compiler warning

Just because it annoys me.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/phy/phy-generic.c b/drivers/usb/phy/phy-generic.c
index 8ee37f4..2d135b0 100644
--- a/drivers/usb/phy/phy-generic.c
+++ b/drivers/usb/phy/phy-generic.c
@@ -162,7 +162,7 @@
 
 	if (dev->of_node) {
 		struct device_node *node = dev->of_node;
-		enum of_gpio_flags flags;
+		enum of_gpio_flags flags = 0;
 
 		if (of_property_read_u32(node, "clock-frequency", &clk_rate))
 			clk_rate = 0;