Make the const_cast explicit to silence a compiler warning.
---
 llvm/tools/clang/lib/Serialization/ASTWriter.cpp |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/llvm/tools/clang/lib/Serialization/ASTWriter.cpp b/llvm/tools/clang/lib/Serialization/ASTWriter.cpp
index ac24098..a4e1ddd 100644
--- a/llvm/tools/clang/lib/Serialization/ASTWriter.cpp
+++ b/llvm/tools/clang/lib/Serialization/ASTWriter.cpp
@@ -1552,7 +1552,7 @@ void ASTWriter::WriteHeaderSearch(const HeaderSearch &HS, StringRef isysroot) {
   
   // Free all of the strings we had to duplicate.
   for (unsigned I = 0, N = SavedStrings.size(); I != N; ++I)
-    free((void*)SavedStrings[I]);
+    free(const_cast<char *>(SavedStrings[I]));
 }
 
 /// \brief Writes the block containing the serialized form of the
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