shell32/shellpath: Fall back to defaults in SHGet(All)UserProfilePath

[Michael Jung]

If the registry entry for the CSIDL_DESKTOP path is invalid, the Desktop 
shellfolder won't initialize, which breaks all of the shell namespace. This 
seems to happen quite often, since some people are removing the Z: drive 
after the initial wineprefixcreate run (See bug 4322). 

With this patch, _SHGet(All)UserProfilePath checks for the path to be returned 
to start with a valid drive letter. If this is not the case, it falls back to 
the default value.

ChangeLog:
Fall back to default value, if path to be returned by 
_SHGet(All)UserProfilePath starts with an invalid drive letter.

 dlls/shell32/shellpath.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
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