api: in constructor function calls, always put the returned object pointer first (or second)

Previously the returned object of constructor functions where sometimes
returned as last, sometimes as first and sometimes as second parameter.
Let's clean this up a bit. Here are the new rules:

1. The object the new object is derived from is put first, if there is any

2. The object we are creating will be returned in the next arguments

3. This is followed by any additional arguments

Rationale:

For functions that operate on an object we always put that object first.
Constructors should probably not be too different in this regard. Also,
if the additional parameters might want to use varargs which suggests to
put them last.

Note that this new scheme only applies to constructor functions, not to
all other functions. We do give a lot of freedom for those.

Note that this commit only changes the order of the new functions we
added, for old ones we accept the wrong order and leave it like that.

2 files changed, 6 insertions, 4 deletions

diff --git a/src/locale/localectl.c b/src/locale/localectl.c
index 5929169fe5..2632305dcc 100644
--- a/src/locale/localectl.c
+++ b/src/locale/localectl.c
@@ -150,11 +150,13 @@ static int set_locale(sd_bus *bus, char **args, unsigned n) {
 
         polkit_agent_open_if_enabled();
 
-        r = sd_bus_message_new_method_call(bus,
+        r = sd_bus_message_new_method_call(
+                        bus,
+                        &m,
                         "org.freedesktop.locale1",
                         "/org/freedesktop/locale1",
                         "org.freedesktop.locale1",
-                        "SetLocale", &m);
+                        "SetLocale");
         if (r < 0)
                 return bus_log_create_error(r);
 
diff --git a/src/locale/localed.c b/src/locale/localed.c
index 7a6a96f68f..de6e3b2f84 100644
--- a/src/locale/localed.c
+++ b/src/locale/localed.c
@@ -366,11 +366,11 @@ static int locale_update_system_manager(Context *c, sd_bus *bus) {
         }
 
         assert(c_set + c_unset == _LOCALE_MAX);
-        r = sd_bus_message_new_method_call(bus,
+        r = sd_bus_message_new_method_call(bus, &m,
                         "org.freedesktop.systemd1",
                         "/org/freedesktop/systemd1",
                         "org.freedesktop.systemd1.Manager",
-                        "UnsetAndSetEnvironment", &m);
+                        "UnsetAndSetEnvironment");
         if (r < 0)
                 return r;