wined3d/context: Fix an oops/crash in context_destroy_gl_resources().

[Adam Martinson]

Introduced by 96b150929b0791c7c30ade49d55cedf2d608537e.
---
  dlls/wined3d/context.c |    5 ++++-
  1 files changed, 4 insertions(+), 1 deletions(-)


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