try fix dra v6 4.1-4.2.1 on touch 4

Author: LukeZGD

resources/patch/old/iPod4,1/5.1.1/asr.patch

@@ -5315,15 +5315,15 @@ ipsw_prepare_multipatch() {
             9B*     ) base_build="9B206";;
             9A*     ) base_build="9A405";;
         esac
-        local exploit="src/target/$hw/$base_build/exploit"
+        device_powder_exploit="src/target/$hw/$base_build/exploit"
         ipsw_prepare_partition_script
         log "Adding exploit and partition stuff"
         "$dir/hfsplus" RestoreRamdisk.dec untar src/bin.tar
         "$dir/hfsplus" RestoreRamdisk.dec mv sbin/reboot sbin/reboot_
         "$dir/hfsplus" RestoreRamdisk.dec add partition sbin/reboot
         "$dir/hfsplus" RestoreRamdisk.dec chmod 755 sbin/reboot
         "$dir/hfsplus" RestoreRamdisk.dec chown 0:0 sbin/reboot
-        "$dir/hfsplus" RestoreRamdisk.dec add $exploit exploit
+        "$dir/hfsplus" RestoreRamdisk.dec add $device_powder_exploit exploit
         # dummy "ios" file
         if [[ $ipsw_jailbreak == 1 ]]; then
             local ios="ios${device_target_vers:0:1}"