fileio: make use of DEFINE_TRIVIAL_CLEANUP_FUNC where it makes sense

src/basic/fileio.c

@@ -1527,9 +1527,7 @@ int mkdtemp_malloc(const char *template, char **ret) {
         return 0;
 }
 
-static inline void funlockfilep(FILE **f) {
-        funlockfile(*f);
-}
+DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, funlockfile);
 
 int read_line(FILE *f, size_t limit, char **ret) {
         _cleanup_free_ char *buffer = NULL;