libcamera: Replace plain pointers with std::unique<>

libcamera uses std::unique_ptr<> to simplify life time management of
objects and avoid leaks. For historical reasons there are a fair number
of plain pointers with manual memory management. Replace them with
std::unique_ptr<> when the conversion is simple.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Milan Zamazal <mzamazal@redhat.com>
Reviewed-by: Isaac Scott <isaac.scott@ideasonboard.com>
Reviewed-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>

src/libcamera/ipc_unixsocket.cpp

@@ -70,7 +70,7 @@ LOG_DEFINE_CATEGORY(IPCUnixSocket)
  */
 
 IPCUnixSocket::IPCUnixSocket()
-	: headerReceived_(false), notifier_(nullptr)
+	: headerReceived_(false)
 {
 }
 
@@ -130,7 +130,7 @@ int IPCUnixSocket::bind(UniqueFD fd)
 		return -EINVAL;
 
 	fd_ = std::move(fd);
-	notifier_ = new EventNotifier(fd_.get(), EventNotifier::Read);
+	notifier_ = std::make_unique<EventNotifier>(fd_.get(), EventNotifier::Read);
 	notifier_->activated.connect(this, &IPCUnixSocket::dataNotifier);
 
 	return 0;
@@ -146,8 +146,7 @@ void IPCUnixSocket::close()
 	if (!isBound())
 		return;
 
-	delete notifier_;
-	notifier_ = nullptr;
+	notifier_.reset();
 
 	fd_.reset();
 	headerReceived_ = false;