[PATCH 2/3] lib/test_kmod: take the lock in register_test_dev_kmod()

[Dan Carpenter]

We accidentally just drop the lock twice instead of taking it and then
releasing it.

Fixes: 39258f448d71 ("kmod: add test driver to stress test the module loader")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/lib/test_kmod.c b/lib/test_kmod.c
index 8797400b8bda..093b44771197 100644
--- a/lib/test_kmod.c
+++ b/lib/test_kmod.c
@@ -1146,7 +1146,7 @@ static struct kmod_test_device 
*register_test_dev_kmod(void)
        struct kmod_test_device *test_dev = NULL;
        int ret;
 
-       mutex_unlock(&reg_dev_mutex);
+       mutex_lock(&reg_dev_mutex);
 
        /* int should suffice for number of devices, test for wrap */
        if (unlikely(num_test_devs + 1) < 0) {