try2 [1/1] kernel32: Fix GetVolumeNameForVolumeMountPointW to match Mountmgr

[Guy Albertelli]

mountmgr.sys uses a specific format for "unique volume name", make
GetVolumeNameForVolumeMountPointW use mountmgr to return that specific
unique volume name.

Cleaned up code per comments and with an enhanced test.

Changelog
  - Make GetVolumeNameForVolumeMountPointW use mountmgr.sys to return
    the correct "unique volume name"
  - Correct error returns and issue FIXME for mounted folders
---
 dlls/kernel32/tests/volume.c |   14 ++---
 dlls/kernel32/volume.c       |  132 +++++++++++++++++++++++++++++++++++++++--
 2 files changed, 131 insertions(+), 15 deletions(-)

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