[hle] handle NPad shared_memory being null on certain updates and cases (#3860)

Does NOT fix root issue with shared_memory of NPad yet, that is something probably separate
I'd like to suspect it's because every NPad by default it's expected to have shared memory, even when not explicitly initialized, but seems unlikely

Signed-off-by: lizzie <lizzie@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3860
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: crueter <crueter@eden-emu.dev>

src/hid_core/resources/npad/npad.cpp

@@ -157,11 +157,14 @@ void NPad::ControllerUpdate(Core::HID::ControllerTriggerType type, std::size_t c
             if (!controller.device->IsConnected()) {
                 return;
             }
-            auto* shared_memory = controller.shared_memory;
-            const auto& battery_level = controller.device->GetBattery();
-            shared_memory->battery_level_dual = battery_level.dual.battery_level;
-            shared_memory->battery_level_left = battery_level.left.battery_level;
-            shared_memory->battery_level_right = battery_level.right.battery_level;
+            if (auto* shared_memory = controller.shared_memory; shared_memory) {
+                const auto& battery_level = controller.device->GetBattery();
+                shared_memory->battery_level_dual = battery_level.dual.battery_level;
+                shared_memory->battery_level_left = battery_level.left.battery_level;
+                shared_memory->battery_level_right = battery_level.right.battery_level;
+            } else {
+                LOG_WARNING(Service_HID, "shared_memory is null {}", controller_idx);
+            }
             break;
         }
         default:
@@ -180,6 +183,10 @@ void NPad::InitNewlyAddedController(u64 aruid, Core::HID::NpadIdType npad_id) {
     const auto& body_colors = controller.device->GetColors();
     const auto& battery_level = controller.device->GetBattery();
     auto* shared_memory = controller.shared_memory;
+    if (!shared_memory) {
+        LOG_WARNING(Service_HID, "shared_memory is null for npad_id={}", npad_id);
+        return;
+    }
     if (controller_type == Core::HID::NpadStyleIndex::None) {
         npad_resource.SignalStyleSetUpdateEvent(aruid, npad_id);
         return;
@@ -801,7 +808,7 @@ Result NPad::DisconnectNpad(u64 aruid, Core::HID::NpadIdType npad_id) {
 
     auto* shared_memory = controller.shared_memory;
     if (!shared_memory) {
-        LOG_WARNING(Service_HID, "DisconnectNpad: shared_memory is null for npad_id={}", npad_id);
+        LOG_WARNING(Service_HID, "shared_memory is null for npad_id={}", npad_id);
         return ResultSuccess;
     }
     // Don't reset shared_memory->assignment_mode this value is persistent
@@ -1195,11 +1202,10 @@ const Core::HID::SixAxisSensorProperties& NPad::GetSixaxisProperties(
 
 AppletDetailedUiType NPad::GetAppletDetailedUiType(Core::HID::NpadIdType npad_id) {
     const auto aruid = applet_resource_holder.applet_resource->GetActiveAruid();
-    const auto& shared_memory = GetControllerFromNpadIdType(aruid, npad_id).shared_memory;
-
+    const auto* shared_memory = GetControllerFromNpadIdType(aruid, npad_id).shared_memory;
     return {
         .ui_variant = 0,
-        .footer = shared_memory->applet_footer_type,
+        .footer = shared_memory ? shared_memory->applet_footer_type : AppletFooterUiType::None,
     };
 }