widl: Fix context handle "cannot be null" detection.

[Robert Shearman]

The "cannot be null" attibute is applied to a parameter if and only if 
it is in-only.
---
  tools/widl/typegen.c |    8 ++++----
  1 files changed, 4 insertions(+), 4 deletions(-)
-------------- next part --------------
A non-text attachment was scrubbed...
Name: 8a9b0c640ef8a0f7a48854ffb82f09a631e11f89.diff
Type: text/x-patch
Size: 618 bytes
Desc: not available
Url : http://www.winehq.org/pipermail/wine-patches/attachments/20080107/e8fe64f9/attachment.bin