Recover from init fail

src/drivers/i2c_bus.rs

@@ -30,8 +30,7 @@ where
             }
             Err(e) => {
                 log::error!("Shared I2C bus initialization failed for GPIO17/GPIO18: {e:?}");
-                unimplemented!("Partial move makes it impossible to retry.");
+                Err(self)
-                // Err(self)
             }
         }
     }