Thread safety: small formatting change

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@139548 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/ThreadSafety.cpp

@@ -676,7 +676,8 @@ static void warnBackEdgeUnequalLocksets(ThreadSafetyHandler &Handler,
 }
 
 
-namespace clang { namespace thread_safety {
+namespace clang {
+namespace thread_safety {
 /// \brief Check a function's CFG for thread-safety violations.
 ///
 /// We traverse the blocks in the CFG, compute the set of mutexes that are held