wintab32: Avoid NULL pointer dereferences.

[Peter Urbanec]

This patch fixes wine crashes due to NULL pointer dereferences in 
wintab32 seen on some systems.


---
  dlls/wintab32/context.c  |   50 
++++++++++++++++++++++++++++++++++++++++-----
  dlls/wintab32/wintab32.c |   28 +++++++++++++++----------
  2 files changed, 61 insertions(+), 17 deletions(-)


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