Refactor get_freebsd()

quickget

@@ -930,10 +930,10 @@ function get_freebsd() {
     local ISO=""
     local URL=""
 
+    URL="https://download.freebsd.org/ftp/releases/amd64/amd64/ISO-IMAGES/${RELEASE}"
     ISO="FreeBSD-${RELEASE}-RELEASE-amd64-dvd1.iso"
-    HASH=$(wget -q -O- "https://download.freebsd.org/ftp/releases/amd64/amd64/ISO-IMAGES/${RELEASE}/CHECKSUM.SHA512-FreeBSD-${RELEASE}-RELEASE-amd64" | grep '('"${ISO}"')' | cut -d' ' -f4)
-    URL="https://download.freebsd.org/ftp/releases/amd64/amd64/ISO-IMAGES/${RELEASE}/${ISO}"
-    web_get "${URL}" "${VM_PATH}"
+    HASH=$(wget -q -O- "${URL}/CHECKSUM.SHA512-FreeBSD-${RELEASE}-RELEASE-amd64" | grep "${ISO}" | cut -d' ' -f4)
+    web_get "${URL}/${ISO}" "${VM_PATH}"
     check_hash "${ISO}" "${HASH}"
     make_vm_config "${ISO}"
 }