mpr: fix NULL pointer dereference in WNetGetResourceInformationW

[Andrey Turkin]

The dereference was spotted by Anastasius Focht in bug 13737; this patch
fixes this bug.
---
 dlls/mpr/wnet.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
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