zynq: fix previous commit

zynq.nix

@@ -1,8 +1,9 @@
 let
+  pkgs = import <nixpkgs> {};
   zynq-rs-latest = import <zynq-rs>;
   artiq-zynq = import <artiq-zynq>;
   zynq-rs = import "${artiq-zynq}/zynq-rs.nix";
-  pkgs = import <nixpkgs> {};
+  zc706-szl = (import zynq-rs).zc706-szl;
   artiq-fast = import <artiq-fast> { inherit pkgs; };
 in
   (
@@ -40,8 +41,8 @@ in
         echo Power cycle done.
 
         export USER=hydra
-        export OPENOCD_ZYNQ=${<zynq-rs>}/openocd
-        export SZL=${zynq-rs.zc706-szl}/szl.elf
+        export OPENOCD_ZYNQ=${zynq-rs}/openocd
+        export SZL=${zc706-szl}/szl.elf
         pushd ${<artiq-zynq>}
         bash ${<artiq-zynq>}/remote_run.sh -h rpi-4 -o "-F /dev/null -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o LogLevel=ERROR -i /opt/hydra_id_rsa" -d ${artiq-zynq.zc706-nist_qc2-jtag}
         popd