Corrections in winutils/chmod.c

There are two small things in winutils/chmod.c:

pathName should be pointer to a constant WSTR
the declartion

LPWSTR pathName = NULL;

seems to be wrong.

LPCWSTR pathName = NULL;
should b used instead.

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I believe the fragment

switch (c)
{
case NULL:

to be wrong as pointers are not permitted as
case values.

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