Cleanup: warning

source/blender/blenkernel/intern/particle_system.c

@@ -3912,7 +3912,7 @@ static void particles_fluid_step(Main *bmain, ParticleSimulationData *sim, int U
 		} // fluid sim particles done
 	}
 #else
-	UNUSED_VARS(use_render_params);
+	UNUSED_VARS(bmain, use_render_params);
 #endif // WITH_MOD_FLUID
 }