usb: fix compile warning in isp1760

drivers/usb/host/isp1760-if.c:275: warning: 'ret' is used uninitialized in this function

Signed-off-by: Sebastian Siewior <bigeasy@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/host/isp1760-if.c b/drivers/usb/host/isp1760-if.c
index 73fb2a3..440bf94 100644
--- a/drivers/usb/host/isp1760-if.c
+++ b/drivers/usb/host/isp1760-if.c
@@ -256,7 +256,7 @@
 
 static int __init isp1760_init(void)
 {
-	int ret;
+	int ret = -ENODEV;
 
 	init_kmem_once();