Qutex: Add currOwner pointer for debugging

We'll use this to detect gridlock-type deadlocks between
two requests

include/qutex.h

@@ -28,7 +28,7 @@ public:
 	Qutex([[maybe_unused]] const std::string &_name)
 	:
 #ifdef CONFIG_ENABLE_DEBUG_LOCKS
-	name(_name),
+	name(_name), currOwner(nullptr),
 #endif
 	isOwned(false)
 	{}
@@ -92,6 +92,7 @@ public:
 public:
 #ifdef CONFIG_ENABLE_DEBUG_LOCKS
 	std::string name;
+	LockerAndInvokerBase* currOwner;
 #endif
 	SpinLock lock;
 	LockerAndInvokerBase::List queue;