Fix unused variable warning.

llvm-svn: 236178

clang/lib/Lex/PPMacroExpansion.cpp

@@ -279,7 +279,7 @@ static bool isTrivialSingleTokenExpansion(const MacroInfo *MI,
   // If the identifier is a macro, and if that macro is enabled, it may be
   // expanded so it's not a trivial expansion.
   if (auto *ExpansionMI = PP.getMacroInfo(II))
-    if (PP.getMacroInfo(II)->isEnabled() &&
+    if (ExpansionMI->isEnabled() &&
         // Fast expanding "#define X X" is ok, because X would be disabled.
         II != MacroIdent)
       return false;