WS Lib: Fixed byte order of fixed channel

Author: Jarkko Paso

source/6LoWPAN/ws/ws_ie_lib.c

@@ -171,7 +171,7 @@ uint8_t *ws_wp_nested_hopping_schedule_write(uint8_t *ptr,struct ws_hopping_sche
     switch (hopping_schedule->channel_function) {
         case 0:
             //Fixed channel inline
-            ptr = common_write_16_bit(hopping_schedule->fixed_channel, ptr);
+            ptr = common_write_16_bit_inverse(hopping_schedule->fixed_channel, ptr);
             break;
         case 1:
         case 2: