Add check for NULL before calling kthread_stop().

There were cases in which gserial_console_exit() was called, but the
console thread was not started. This resulted in an invalid
kthread_stop(NULL) call.

Signed-off-by: Felix Hädicke <[email protected]>
---
 drivers/usb/gadget/function/u_serial.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/u_serial.c 
b/drivers/usb/gadget/function/u_serial.c
index 5fedead..f58c775 100644
--- a/drivers/usb/gadget/function/u_serial.c
+++ b/drivers/usb/gadget/function/u_serial.c
@@ -1256,7 +1256,8 @@ static void gserial_console_exit(void)
        struct gscons_info *info = &gscons_info;
 
        unregister_console(&gserial_cons);
-       kthread_stop(info->console_thread);
+       if (info->console_thread != NULL)
+               kthread_stop(info->console_thread);
        gs_buf_free(&info->con_buf);
 }
 
-- 
2.10.2

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