c-index-test shouldn't crash when a goto has no matching label.  Fixes <rdar://problem/9123493>.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@127711 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CIndex.cpp b/tools/libclang/CIndex.cpp
index 290146f..538efd7 100644
--- a/tools/libclang/CIndex.cpp
+++ b/tools/libclang/CIndex.cpp
@@ -3709,7 +3709,9 @@
   if (clang_isStatement(C.kind)) {
     Stmt *S = getCursorStmt(C);
     if (GotoStmt *Goto = dyn_cast_or_null<GotoStmt>(S))
-      return MakeCXCursor(Goto->getLabel()->getStmt(), getCursorDecl(C), tu);
+      if (LabelDecl *label = Goto->getLabel())
+        if (LabelStmt *labelS = label->getStmt())
+        return MakeCXCursor(labelS, getCursorDecl(C), tu);
 
     return clang_getNullCursor();
   }