Get rid of the cut call and replace it with a shell substitution.

initramfs/init

@@ -121,7 +121,7 @@ for var in $(cat /proc/cmdline); do
         url="${url/|*}"
         (
             if [[ ${url_type} = "uuid" ]]; then
-                uuid="$(echo ${url} | /busybox cut -d / -f 1)"
+                uuid="${url%%/*}"
                 filepath="${url#*/}"
 
                 info "mounting $(findfs UUID="${uuid}") on /mnt"