[2/2] kernel32: Fix GetVolumeNameForVolumeMountPointW to match Mountmgr

[Guy Albertelli]

mountmgr.sys uses a specific format for "unique volume name", make
GetVolumeNameForVolumeMountPointW use mountmgr.sys to retrieve the
correct unique volume name.

Changelog
  - Make GetVolumeNameForVolumeMountPointW use mountmgr.sys for
    format of "unique volume name"
  - Correct error returns and issue FIXME for mounted folders
---
 dlls/kernel32/tests/volume.c |    6 --
 dlls/kernel32/volume.c       |  140 +++++++++++++++++++++++++++++++++++++++--
 2 files changed, 133 insertions(+), 13 deletions(-)

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