Refactor get_linuxmint()

quickget

@@ -984,13 +984,12 @@ function get_linuxmint() {
 
     validate_release "releases_linuxmint"
     FLAVOR=$(echo "${OS}" | cut -d'-' -f2)
+    URL="https://mirror.bytemark.co.uk/linuxmint/stable/${RELEASE}"
     ISO="linuxmint-${RELEASE}-${FLAVOR}-64bit.iso"
-    HASH=$(wget -q -O- "https://mirror.bytemark.co.uk/linuxmint/stable/${RELEASE}/sha256sum.txt" | grep "${ISO}" | cut -d' ' -f1)
-    URL="https://mirror.bytemark.co.uk/linuxmint/stable/${RELEASE}/${ISO}"
-    web_get "${URL}" "${VM_PATH}"
+    HASH=$(wget -q -O- "${URL}/${RELEASE}/sha256sum.txt" | grep "${ISO}" | cut -d' ' -f1)
+    web_get "${URL}/${ISO}" "${VM_PATH}"
     check_hash "${ISO}" "${HASH}"
     make_vm_config "${ISO}"
-
 }
 
 function get_manjaro() {