base-files: strip quotes from the MAC address in macaddr_canonicalize()

Extracted from http://patchwork.openwrt.org/patch/5716/

Signed-off-by: Forest Crossman <cyrozap@gmail.com>
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

SVN-Revision: 41639

package/base-files/files/lib/functions/system.sh

@@ -82,6 +82,7 @@ macaddr_canonicalize()
 	local mac="$1"
 	local canon=""
 
+	mac=$(echo -n $mac | tr -d \")
 	[ ${#mac} -gt 17 ] && return
 	[ -n "${mac//[a-fA-F0-9\.: -]/}" ] && return