[patch] remove crashes in putenv(): use "" instead of NULL value

[Christian Ehrlicher]

> Von: "Jarosław Staniek"
> For review; remove crashes in putenv(): use "" instead of NULL value
> (needed 
> e.g. for unsetenv()).
> 
> NULL values caused a crash in strlen() and _putenv_s(), at least on Vista.
> 
> Noticed that in the code of knotify4:
> 
>    unsetenv( "SESSION_MANAGER" );
Strange but fine with me :)

putenv_s really seems to be to 'more secure' function - it's more secure that it's crashing when using invalid values :D



Christian
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