fix issue #157 fix warnings detected by LGTM.com.

CHANGELOG.md

@@ -49,6 +49,8 @@ Features:
 
   * [#159](http://github.com/Nelson-numerical-software/nelson/issues/159): addpath must return an warning and not an error for an non existing path.
 
+  * [#157](http://github.com/Nelson-numerical-software/nelson/issues/157): fix warnings detected by LGTM.com.
+
   * [#156](http://github.com/Nelson-numerical-software/nelson/issues/156): Moves dbstack in 'debugger' module.
 
 

README.md

@@ -13,7 +13,7 @@
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+[![Total alerts](https://img.shields.io/lgtm/grade/cpp/g/Nelson-numerical-software/nelson.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/Nelson-numerical-software/nelson/alerts/)
 
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