widl: Also arrays need NULL pointer checks.

[Michael Karcher]

This is still not complete. No NULL pointer checks are emitted for parameters
that are aliases to pointers or arrays.
---
 tools/widl/client.c    |    2 +-
 tools/widl/proxy.c     |    7 +++++--
 tools/widl/widltypes.h |    2 +-
 3 files changed, 7 insertions(+), 4 deletions(-)
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