winex11drv: Do extra error checking when opening XInput device.

[Vitaliy Margolen]

It seems some configurations have bogus devices that when opened
will generate a X error and crash Wine. See bug 4579.
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 dlls/winex11.drv/wintab.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
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