silence a warning, I need to talk to Devang about this code.

llvm-svn: 69517
diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
index e7a4a45..1c6043b 100644
--- a/clang/lib/CodeGen/CGDebugInfo.cpp
+++ b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -52,7 +52,7 @@
   // Get source file information.
   const char *FileName =  "<unknown>";
   SourceManager &SM = M->getContext().getSourceManager();
-  unsigned FID;
+  unsigned FID = 0;
   if (Loc.isValid()) {
     PresumedLoc PLoc = SM.getPresumedLoc(Loc);
     FileName = PLoc.getFilename();