[PATCH 0/1] MR8457: kernel32: Update len in wine_get_dos_filename before using it to remove the \??\.

[William Horvath (＠whrvt)]

The wcscat increases the size, so this happened:

```
trace:file:wine_get_dos_file_name start: "/usr/lib32/libXext.so.6"
trace:file:NtCreateFile handle=0x109f37c access=80000000 name=L"\??\unix\usr\lib32\libXext.so.6" objattr=00000000 root=(nil) sec=(nil) io=0x109f380 alloc_size=(nil) attr=00000000 sharing=00000003 disp=1 options=00000020 ea=(nil).0x00000000
trace:file:get_nt_and_unix_names L"\??\unix\usr\lib32\libXext.so.6" -> ret 0 nt L"\??\Z:\usr\lib32\libXext.so.6" unix "/usr/lib32/libXext.so.6"
trace:file:wine_get_dos_file_name end: L"Z:\usr\lib32\libXextXext.so.6"
```