services: linux: Remove redundant definitions

modules/radix/services/linux.scm

@@ -19,15 +19,6 @@
             thinkfan-shepherd-service
             thinkfan-service-type))
 
-(define ((list-of predicate) x)
-  (null? (filter (negate predicate) x)))
-
-(define list-of-symbols?
-  (list-of symbol?))
-
-(define list-of-strings?
-  (list-of string?))
-
 (define-configuration/no-serialization thinkfan-configuration
   (pid-file
    (string "/var/run/thinkfan.pid")
@@ -50,7 +41,7 @@ arbitrary command-line arguments to ‘thinkfan’ as a list of strings."))
            (provision '(thinkfan))
            (documentation
             "Adjust fan level according to configured temperature limits.")
-           (requirement '(user-processes kernel-module-loader))
+           (requirement '(user-processes))
            (start #~(make-forkexec-constructor
                       (list (string-append #$thinkfan-next
                                            "/sbin/thinkfan")