winedos: Fix the type of res in VGA_DoSetMode.

[Rob Shearman]

It should be HRESULT instead of LRESULT.

Add explicit "!= S_OK" to expressions that use HRESULTs as booleans.
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 dlls/winedos/vga.c |   25 ++++++++++++++-----------
 1 files changed, 14 insertions(+), 11 deletions(-)
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