install: define hash_ops for UnitFileList

src/shared/install.c

@@ -3625,6 +3625,14 @@ Hashmap* unit_file_list_free(Hashmap *h) {
 
 DEFINE_TRIVIAL_CLEANUP_FUNC(UnitFileList*, unit_file_list_free_one);
 
+DEFINE_HASH_OPS_WITH_VALUE_DESTRUCTOR(
+        unit_file_list_hash_ops_free,
+        char,
+        string_hash_func,
+        string_compare_func,
+        UnitFileList,
+        unit_file_list_free_one);
+
 int unit_file_get_list(
                 RuntimeScope scope,
                 const char *root_dir,

src/shared/install.h

@@ -196,6 +196,7 @@ int unit_file_exists(RuntimeScope scope, const LookupPaths *paths, const char *n
 
 int unit_file_get_list(RuntimeScope scope, const char *root_dir, Hashmap *h, char **states, char **patterns);
 Hashmap* unit_file_list_free(Hashmap *h);
+extern const struct hash_ops unit_file_list_hash_ops_free;
 
 InstallChangeType install_changes_add(InstallChange **changes, size_t *n_changes, InstallChangeType type, const char *path, const char *source);
 void install_changes_free(InstallChange *changes, size_t n_changes);