Fix BstrWrapTest() test function return type (#160)

Change-Id: Ibfe99745ed651baac79e6cef976a47fccb3dcf8d
Signed-off-by: Adam Kulesza <adam.kulesza@arm.com>

Signed-off-by: Adam Kulesza <adam.kulesza@arm.com>
Co-authored-by: Adam Kulesza <adam.kulesza@arm.com>
diff --git a/test/qcbor_encode_tests.c b/test/qcbor_encode_tests.c
index bfb4a83..0e2ea77 100644
--- a/test/qcbor_encode_tests.c
+++ b/test/qcbor_encode_tests.c
@@ -1,7 +1,7 @@
 /*==============================================================================
  Copyright (c) 2016-2018, The Linux Foundation.
  Copyright (c) 2018-2021, Laurence Lundblade.
- All rights reserved.
+ Copyright (c) 2022, Arm Limited. All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
@@ -1772,7 +1772,7 @@
 /*
  * bstr wrapping test
  */
-int BstrWrapTest()
+int32_t BstrWrapTest()
 {
    QCBOREncodeContext EC;