shellpath.c: Avoid copying invalid data on error

[Juan Lang]

The following patch misses one source of possible
failure, if _SHExpandEnvironmentStrings fails:
http://www.winehq.org/hypermail/wine-cvs/2004/10/0309.html

The following is a better patch, I think, in that
- it doesn't add a break statement to the default case
(some compilers warn on this)
- it corrects the invalid data case by 1) initializing
szTemp and 2) checking hr just before the copy

ChangeLog: Avoid copying invalid data on error


--Juan


		
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