azure_kinect_ros_driver.patch

diff --git a/launch/kinect_rgbd.launch b/launch/kinect_rgbd.launch
index 4222a41..55113a4 100644
--- a/launch/kinect_rgbd.launch
+++ b/launch/kinect_rgbd.launch
@@ -93,7 +93,7 @@
       <param name="point_cloud"                   value="$(arg point_cloud)" />
       <param name="rgb_point_cloud"               value="$(arg rgb_point_cloud)" />
       <param name="point_cloud_in_depth_frame"    value="$(arg point_cloud_in_depth_frame)" />
-      <param name="sensor_sn"                     value="$(arg sensor_sn)" />
+      <param name="sensor_sn" type="string"       value="$(arg sensor_sn)" />
       <param name="tf_prefix"                     value="$(arg tf_prefix)" />
       <param name="recording_file"                value="$(arg recording_file)" />
       <param name="recording_loop_enabled"        value="$(arg recording_loop_enabled)" />