widl: Fix symbol was not declared and using plain integer as NULL pointer sparse warnings.

[Rob Shearman]

---
 tools/widl/parser.h  |    2 ++
 tools/widl/parser.l  |    2 --
 tools/widl/typegen.c |    8 ++++----
 tools/widl/widl.c    |   39 +++++++++++++++++++--------------------
 4 files changed, 25 insertions(+), 26 deletions(-)
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