crypto: qce50: fix llvm compilation warnings

Compiling kernel with upstream LLVM tool chain
gives warning related to bool operator.

Change-Id: I0291d7ca7df9141df68305746242cb7c9384d3c7
Signed-off-by: Vijayakumar Badiger <vbadig@codeaurora.org>

drivers/crypto/msm/qce50.c

@@ -1,7 +1,7 @@
 /*
  * QTI Crypto Engine driver.
  *
- * Copyright (c) 2012-2019, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2012-2020, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -4676,7 +4676,7 @@ again:
 			pce_dev->intr_cadence = 0;
 			atomic_set(&pce_dev->bunch_cmd_seq, 0);
 			atomic_set(&pce_dev->last_intr_seq, 0);
-			pce_dev->cadence_flag = ~pce_dev->cadence_flag;
+			pce_dev->cadence_flag = !pce_dev->cadence_flag;
 		}
 	}