Use dyn_cast result instead of re-casting. Fixes -Werror build with:
/llvm/tools/clang/tools/libclang/CIndex.cpp:1823: error: unused variable 'E' [-Wunused-variable]


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@118947 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed