[PATCH] Fix crash in typo correction while correcting enum within a struct in C

[Olivier Goffart]

Hi,

Please review the attached patch.
It fix a crash while trying to compile the code that is in the testcase (in C 
mode). This crash is a regression since 3.5

The problem is that "isCXXClassMember" for the NameDecl of the enum values 
returns true even tough we are in C mode. Therefore, the DeclContext is not a 
CXXRecordDecl, but just a plain RecordDecl.
I'm taking the least intrusive approach by handling the case in which the cast 
would otherwise fail.

Thanks
-- 
Olivier
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