nvflinger: Mark locals const where applicable

Makes non-mutable state more explicit.

src/core/hle/service/nvflinger/nvflinger.cpp

@@ -54,8 +54,8 @@ u64 NVFlinger::OpenDisplay(std::string_view name) {
     // TODO(Subv): Currently we only support the Default display.
     ASSERT(name == "Default");
 
-    auto itr = std::find_if(displays.begin(), displays.end(),
-                            [&](const Display& display) { return display.name == name; });
+    const auto itr = std::find_if(displays.begin(), displays.end(),
+                                  [&](const Display& display) { return display.name == name; });
 
     ASSERT(itr != displays.end());
 
@@ -67,8 +67,8 @@ u64 NVFlinger::CreateLayer(u64 display_id) {
 
     ASSERT_MSG(display.layers.empty(), "Only one layer is supported per display at the moment");
 
-    u64 layer_id = next_layer_id++;
-    u32 buffer_queue_id = next_buffer_queue_id++;
+    const u64 layer_id = next_layer_id++;
+    const u32 buffer_queue_id = next_buffer_queue_id++;
     auto buffer_queue = std::make_shared<BufferQueue>(buffer_queue_id, layer_id);
     display.layers.emplace_back(layer_id, buffer_queue);
     buffer_queues.emplace_back(std::move(buffer_queue));
@@ -85,16 +85,16 @@ Kernel::SharedPtr<Kernel::ReadableEvent> NVFlinger::GetVsyncEvent(u64 display_id
 }
 
 std::shared_ptr<BufferQueue> NVFlinger::GetBufferQueue(u32 id) const {
-    auto itr = std::find_if(buffer_queues.begin(), buffer_queues.end(),
-                            [&](const auto& queue) { return queue->GetId() == id; });
+    const auto itr = std::find_if(buffer_queues.begin(), buffer_queues.end(),
+                                  [&](const auto& queue) { return queue->GetId() == id; });
 
     ASSERT(itr != buffer_queues.end());
     return *itr;
 }
 
 Display& NVFlinger::GetDisplay(u64 display_id) {
-    auto itr = std::find_if(displays.begin(), displays.end(),
-                            [&](const Display& display) { return display.id == display_id; });
+    const auto itr = std::find_if(displays.begin(), displays.end(),
+                                  [&](const Display& display) { return display.id == display_id; });
 
     ASSERT(itr != displays.end());
     return *itr;
@@ -103,8 +103,8 @@ Display& NVFlinger::GetDisplay(u64 display_id) {
 Layer& NVFlinger::GetLayer(u64 display_id, u64 layer_id) {
     auto& display = GetDisplay(display_id);
 
-    auto itr = std::find_if(display.layers.begin(), display.layers.end(),
-                            [&](const Layer& layer) { return layer.id == layer_id; });
+    const auto itr = std::find_if(display.layers.begin(), display.layers.end(),
+                                  [&](const Layer& layer) { return layer.id == layer_id; });
 
     ASSERT(itr != display.layers.end());
     return *itr;
@@ -139,7 +139,7 @@ void NVFlinger::Compose() {
             continue;
         }
 
-        auto& igbp_buffer = buffer->get().igbp_buffer;
+        const auto& igbp_buffer = buffer->get().igbp_buffer;
 
         // Now send the buffer to the GPU for drawing.
         // TODO(Subv): Support more than just disp0. The display device selection is probably based