Fix compiler warning with QCBOR_DISABLE_TAGS

Issue introduced in previous commit.

Co-authored-by: Laurence Lundblade <lgl@securitytheory.com>
diff --git a/src/qcbor_decode.c b/src/qcbor_decode.c
index 7b8ce5c..ee56a5f 100644
--- a/src/qcbor_decode.c
+++ b/src/qcbor_decode.c
@@ -1132,7 +1132,7 @@
    }
 #else /* QCBOR_DISABLE_TAGS */
    (void)nAdditionalInfo;
-   (void)uArgument;
+   (void)uTagNumber;
    (void)pDecodedItem;
    return QCBOR_ERR_TAGS_DISABLED;
 #endif /* QCBOR_DISABLE_TAGS */