From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Fri, 20 Nov 2015 15:09:03 +0100
Subject: ar71xx: fix wndr3700_board_detect for some NETGEAR WNDR3700v2 (again)

When fixing the model string for WNDR3700v2 which contain a model string
followed by 0xff in r46455, the match for other versions of the WNDR3700v2
which just contain lots of 0xff broke (as the 0xff $model is checked for
is stripped off).

Fix by stripping off non-printable characters only for the actual output
string, but not for the internal matching.

diff --git a/target/linux/ar71xx/base-files/lib/ar71xx.sh b/target/linux/ar71xx/base-files/lib/ar71xx.sh
index 388cf38..daebaa4 100755
--- a/target/linux/ar71xx/base-files/lib/ar71xx.sh
+++ b/target/linux/ar71xx/base-files/lib/ar71xx.sh
@@ -37,8 +37,9 @@ wndr3700_board_detect() {
 		machine="NETGEAR WNDR3700"
 		;;
 	"33373031")
-		# Use awk to remove everything after the first zero byte
-		model="$(ar71xx_get_mtd_offset_size_format art 41 32 %c | LC_CTYPE=C awk -v 'FS=[^[:print:]]' '{print $1; exit}')"
+		model="$(ar71xx_get_mtd_offset_size_format art 41 32 %c)"
+		# Use awk to remove everything unprintable
+		model_stripped="$(echo -n "$model" | LC_CTYPE=C awk -v 'FS=[^[:print:]]' '{print $1; exit}')"
 		case $model in
 		$'\xff'*)
 			if [ "${model:24:1}" = 'N' ]; then
@@ -48,14 +49,14 @@ wndr3700_board_detect() {
 			fi
 			;;
 		'29763654+16+64'*)
-			machine="NETGEAR ${model:14}"
+			machine="NETGEAR ${model_stripped:14}"
 			;;
 		'29763654+16+128'*)
-			machine="NETGEAR ${model:15}"
+			machine="NETGEAR ${model_stripped:15}"
 			;;
 		*)
 			# Unknown ID
-			machine="NETGEAR $model"
+			machine="NETGEAR ${model_stripped}"
 		esac
 	esac