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xkbcomp: Don't falsely promise from ExprResolveLhs
Every user of ExprReturnLhs goes on to unconditionally dereference the field return, which can be NULL if xkb_intern_atom fails. Return false if this is the case, so we fail safely. testcase: splice geometry data into interp Signed-off-by: Daniel Stone <daniels@collabora.com>
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CVE-2018-15861.