misc: Fix a bunch of minor issues identified by static analysis

Add some missing initialisation, and fix a handful benign resource
leaks (including some false positives).

src/sim/eventq.cc

@@ -460,29 +460,28 @@ Event::dump() const
 }
 
 EventQueue::EventQueue(const string &n)
-    : objName(n), head(NULL), _curTick(0),
-    async_queue_mutex(new std::mutex())
+    : objName(n), head(NULL), _curTick(0)
 {
 }
 
 void
 EventQueue::asyncInsert(Event *event)
 {
-    async_queue_mutex->lock();
+    async_queue_mutex.lock();
     async_queue.push_back(event);
-    async_queue_mutex->unlock();
+    async_queue_mutex.unlock();
 }
 
 void
 EventQueue::handleAsyncInsertions()
 {
     assert(this == curEventQueue());
-    async_queue_mutex->lock();
+    async_queue_mutex.lock();
 
     while (!async_queue.empty()) {
         insert(async_queue.front());
         async_queue.pop_front();
     }
 
-    async_queue_mutex->unlock();
+    async_queue_mutex.unlock();
 }

src/sim/eventq.hh

@@ -42,6 +42,7 @@
 #include <cassert>
 #include <climits>
 #include <iosfwd>
+#include <memory>
 #include <mutex>
 #include <string>
 
@@ -448,7 +449,7 @@ class EventQueue : public Serializable
     Tick _curTick;
 
     //! Mutex to protect async queue.
-    std::mutex *async_queue_mutex;
+    std::mutex async_queue_mutex;
 
     //! List of events added by other threads to this event queue.
     std::list<Event*> async_queue;