[packages]: net/freeswitch: Fixed sed expression for escaping replaced string in the 'real' sed command.

git-svn-id: svn://svn.openwrt.org/openwrt/packages@22158 3c298f89-4303-0410-b956-a3cf2f4a3e73

net/freeswitch/files/uci/extensions.sh

@@ -6,7 +6,7 @@
 fs_escape_slash() {
 	local inval="$1"
 	[ -z "$inval" ] && return 0
-	echo "$inval" | sed -e 's/([/\\$\^\[\]])/\\\1/g'
+	echo "$inval" | sed -e 's/\([/\\]\)/\\\1/g'
 }
 
 fs_ext_entry() {