Clean up some comments; small rearrangement for max decoder input
diff --git a/inc/qcbor/UsefulBuf.h b/inc/qcbor/UsefulBuf.h
index 41a7b56..2c74f88 100644
--- a/inc/qcbor/UsefulBuf.h
+++ b/inc/qcbor/UsefulBuf.h
@@ -1969,7 +1969,7 @@
       return 0;
    }
 
-   // subtraction can't go neative because of check above
+   // subtraction can't go negative because of check above
    return pMe->UB.len - pMe->cursor;
 }