usb: musb: omap: fix the error check for pm_runtime_get_sync

pm_runtime_get_sync returns a signed integer. In case of errors
it returns a negative value. This patch fixes the error check
by making it signed instead of unsigned thus preventing register
access if get_sync_fails. Also passes the error cause to the
debug message.

Cc: stable@vger.kernel.org
Cc:  Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/musb/omap2430.c

@@ -282,7 +282,8 @@ static void musb_otg_notifier_work(struct work_struct *data_notifier_work)
 
 static int omap2430_musb_init(struct musb *musb)
 {
-	u32 l, status = 0;
+	u32 l;
+	int status = 0;
 	struct device *dev = musb->controller;
 	struct musb_hdrc_platform_data *plat = dev->platform_data;
 	struct omap_musb_board_data *data = plat->board_data;
@@ -301,7 +302,7 @@ static int omap2430_musb_init(struct musb *musb)
 
 	status = pm_runtime_get_sync(dev);
 	if (status < 0) {
-		dev_err(dev, "pm_runtime_get_sync FAILED");
+		dev_err(dev, "pm_runtime_get_sync FAILED %d\n", status);
 		goto err1;
 	}