cap-list: rename capability_set_to_string_alloc() → capability_set_to_string()

We typically don't use the _alloc() suffix anymore for anything, hence
drop it here too.

src/basic/cap-list.c

@@ -56,11 +56,11 @@ int capability_list_length(void) {
         return (int) ELEMENTSOF(capability_names);
 }
 
-int capability_set_to_string_alloc(uint64_t set, char **s) {
+int capability_set_to_string(uint64_t set, char **ret) {
         _cleanup_free_ char *str = NULL;
         size_t n = 0;
 
-        assert(s);
+        assert(ret);
 
         for (unsigned i = 0; i <= cap_last_cap(); i++)
                 if (set & (UINT64_C(1) << i)) {
@@ -88,8 +88,7 @@ int capability_set_to_string_alloc(uint64_t set, char **s) {
 
         str[n > 0 ? n - 1 : 0] = '\0'; /* truncate the last space, if it's there */
 
-        *s = TAKE_PTR(str);
-
+        *ret = TAKE_PTR(str);
         return 0;
 }
 

src/basic/cap-list.h

@@ -7,5 +7,5 @@ const char *capability_to_name(int id);
 int capability_from_name(const char *name);
 int capability_list_length(void);
 
-int capability_set_to_string_alloc(uint64_t set, char **s);
+int capability_set_to_string(uint64_t set, char **ret);
 int capability_set_from_string(const char *s, uint64_t *set);