shlwapi: [PATCH 3/4] Fix results for UrlApplyScheme

[Detlef Riekenberg]

While implementing url:TranslateURL, some issues with
shlwapi:UrlApplyScheme where detected.

- Parameters where not checked
- When successful, the length must not include the terminating 0
- When not sucessful, the buffer must not be modified

-- 
 
By by ... Detlef

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