Patch: Preprocessor::HandleIncludeDirective()

[James Skerrett via cfe-commits]

The attached patch fixes what looks like a bug in the preprocessor when
dealing with missing include files.

Currently, if unable to find a file included via an angled include, the
preprocessor will generate an error diagnostic even when a recovery path is
provided via a callback client.

The patch modifies the if-statement such that the condition expression
matches the descriptive comment above it.
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