usb: musb: core: fix failure path

In the fail1~fail5 failure path, pm_runtime_disable() should
be called to avoid 'Unbalanced pm_runtime_enable' error in
next probe() which may be triggered by defer probe or next
'modprobe musb_hdrc'.

Cc: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Cc: <stable@vger.kernel.org> v3.8
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/musb/musb_core.c

@@ -1993,6 +1993,7 @@ fail2:
 	musb_platform_exit(musb);
 
 fail1:
+	pm_runtime_disable(musb->controller);
 	dev_err(musb->controller,
 		"musb_init_controller failed with status %d\n", status);