Fix: Cycles assert in device consistency check

A regression since #118841.

It is possible that the selected preference device is not found, in which
case a default-initialized DeviceInfo would have added to the list. This
device is set to CPU, but with differnet other fields (such as description)
compared to the actual CPU device.

Pull Request: https://projects.blender.org/blender/blender/pulls/122701

intern/cycles/blender/device.cpp

@@ -108,8 +108,8 @@ DeviceInfo blender_device_info(BL::Preferences &b_preferences,
   /* Default to CPU device. */
   DeviceInfo cpu_device = Device::available_devices(DEVICE_MASK_CPU).front();
 
-  /* Device, which is choosen in the Blender Preferences. */
-  preferences_device = DeviceInfo();
+  /* Device, which is choosen in the Blender Preferences. Default to CPU device. */
+  preferences_device = cpu_device;
 
   /* Test if we are using GPU devices. */
   ComputeDevice compute_device = (ComputeDevice)get_enum(
@@ -155,10 +155,10 @@ DeviceInfo blender_device_info(BL::Preferences &b_preferences,
       preferences_device = Device::get_multi_device(used_devices, threads, background);
     }
   }
-  else {
-    preferences_device = cpu_device;
+
+  if (preferences_device != cpu_device) {
+    adjust_device_info(preferences_device, cpreferences, preview);
   }
-  adjust_device_info(preferences_device, cpreferences, preview);
   adjust_device_info(cpu_device, cpreferences, preview);
 
   /* Device, which will be used, according to Settings, Scene preferences and command line

intern/cycles/device/device.h

@@ -127,6 +127,10 @@ class DeviceInfo {
     return id == info.id && use_hardware_raytracing == info.use_hardware_raytracing &&
            kernel_optimization_level == info.kernel_optimization_level;
   }
+  bool operator!=(const DeviceInfo &info) const
+  {
+    return !(*this == info);
+  }
 };
 
 /* Device */