clang-format: Fix crasher caused by not properly setting dry-run.

llvm-svn: 227427
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
index 65a7bff..f099f20 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -3081,6 +3081,8 @@
                "  if (aaaaaaaaaaaaaaaaaaaaaaaa) return;\n"
                "}, a);",
                Style);
+
+  verifyNoCrash("^{v^{a}}");
 }
 
 TEST_F(FormatTest, IndividualStatementsOfNestedBlocks) {