Nest some more namespaces

Did someone previously suggest that all namespace had been
nested?  Silly.

Signed-off-by: Stephan Pleines <pleines.stephan@gmail.com>
Change-Id: I22278c1caaeba8b47dc46fb2ed3078c20a11e190
diff --git a/aos/ipc_lib/lockless_queue.h b/aos/ipc_lib/lockless_queue.h
index 14a11b6..4f867b9 100644
--- a/aos/ipc_lib/lockless_queue.h
+++ b/aos/ipc_lib/lockless_queue.h
@@ -18,8 +18,7 @@
 #include "aos/time/time.h"
 #include "aos/uuid.h"
 
-namespace aos {
-namespace ipc_lib {
+namespace aos::ipc_lib {
 
 // Structure to hold the state required to wake a watcher.
 struct Watcher {
@@ -478,7 +477,6 @@
 // Prints to stdout the data inside the queue for debugging.
 void PrintLocklessQueueMemory(const LocklessQueueMemory *memory);
 
-}  // namespace ipc_lib
-}  // namespace aos
+}  // namespace aos::ipc_lib
 
 #endif  // AOS_IPC_LIB_LOCKLESS_QUEUE_H_