Useful_Set interface changed to be more in line with UsefulBulf conventions
diff --git a/test/qcbor_decode_tests.c b/test/qcbor_decode_tests.c
index 0bc2525..9e61dd5 100644
--- a/test/qcbor_decode_tests.c
+++ b/test/qcbor_decode_tests.c
@@ -2171,7 +2171,7 @@
    if((nCBORError = QCBORDecode_GetNext(&DC, &Item4)))
       return nCBORError;
    
-   UsefulBuf_Set(&CopyOfStorage, '_');
+   UsefulBuf_Set(CopyOfStorage, '_');
    
    if(Item1.uLabelType != QCBOR_TYPE_TEXT_STRING ||
       Item1.label.string.len != 13 ||