RDMA/rxe: Fix the problem "mutex_destroy missing"

When a mutex lock is not used any more, the function mutex_destroy
should be called to mark the mutex lock uninitialized.

Fixes: 8700e3e ("Soft RoCE driver")
Signed-off-by: Yanjun.Zhu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Daisuke Matsuda <[email protected]>
Signed-off-by: Leon Romanovsky <[email protected]>

Author: zhuyj

drivers/infiniband/sw/rxe/rxe.c

@@ -33,6 +33,8 @@ void rxe_dealloc(struct ib_device *ib_dev)
 
 	if (rxe->tfm)
 		crypto_free_shash(rxe->tfm);
+
+	mutex_destroy(&rxe->usdev_lock);
 }
 
 /* initialize rxe device parameters */