Correctly initialize LineSectionSymbol. Thanks to Duncan Sands for noticing it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151979 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/MC/MCObjectStreamer.cpp b/lib/MC/MCObjectStreamer.cpp
index a7eb8b0..906bdc3 100644
--- a/lib/MC/MCObjectStreamer.cpp
+++ b/lib/MC/MCObjectStreamer.cpp
@@ -266,7 +266,7 @@
 
 void MCObjectStreamer::FinishImpl() {
   // Dump out the dwarf file & directory tables and line tables.
-  const MCSymbol *LineSectionSymbol;
+  const MCSymbol *LineSectionSymbol = NULL;
   if (getContext().hasDwarfFiles())
     LineSectionSymbol = MCDwarfFileTable::Emit(this);