minor fixes in shim

eraser

@@ -13,8 +13,8 @@ check_ver() {
     }
 
 # Check network connection
-if nc -zw1 lab.compute.dtu.dk 22 &>/dev/null: then
-    check_ver()
+if nc -zw1 lab.compute.dtu.dk 22 &>/dev/null; then
+    check_ver
     ./ssd-eraser
 else
     ./ssd-eraser