Fix Casting

Use const_cast<> to avoid a cast-away-const error.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@172564 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CXSourceLocation.cpp b/tools/libclang/CXSourceLocation.cpp
index a6a031e..2b3a300 100644
--- a/tools/libclang/CXSourceLocation.cpp
+++ b/tools/libclang/CXSourceLocation.cpp
@@ -232,7 +232,7 @@
   }
   
   if (file)
-    *file = (void *)SM.getFileEntryForSLocEntry(sloc);
+    *file = const_cast<FileEntry *>(SM.getFileEntryForSLocEntry(sloc));
   if (line)
     *line = SM.getExpansionLineNumber(ExpansionLoc);
   if (column)
@@ -309,7 +309,7 @@
     return createNullLocation(file, line, column, offset);
   
   if (file)
-    *file = (void *)SM.getFileEntryForID(FID);
+    *file = const_cast<FileEntry *>(SM.getFileEntryForID(FID));
   if (line)
     *line = SM.getLineNumber(FID, FileOffset);
   if (column)