As of OpenWrt commit b3d8b3ab8e6f ("mac80211: set noscan=1 if sta/adhoc/
mesh interfaces are present"), the issue workarounded by this patch cannot
occur anymore.

Most doubles that are delivered via respondd have limited input
precision, but are converted with up to 17 digits of precision. That can
cause ugly blowups like 0.2800000000000001 in the output, which is
avoided by specifying better format strings (like "%.2f" in most cases).