timedate: fix memory leak in timedated

$ /usr/lib/systemd/systemd-timedated (wait until auto-exit)

=================================================================
==396==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 928 byte(s) in 1 object(s) allocated from:
    #0 0x7f782f788db1 in __interceptor_calloc (/usr/lib64/libasan.so.2+0x96db1)
    #1 0x562a83ae60cf in bus_message_from_header src/libsystemd/sd-bus/bus-message.c:480
    #2 0x562a83ae6f5a in bus_message_from_malloc src/libsystemd/sd-bus/bus-message.c:576
    #3 0x562a83ad3cad in bus_socket_make_message src/libsystemd/sd-bus/bus-socket.c:915
    #4 0x562a83ad4cfc in bus_socket_read_message src/libsystemd/sd-bus/bus-socket.c:1051
    #5 0x562a83ab733f in bus_read_message src/libsystemd/sd-bus/sd-bus.c:1647
    #6 0x562a83ab98ea in sd_bus_call src/libsystemd/sd-bus/sd-bus.c:2038
    #7 0x562a83b1f46d in sd_bus_call_method src/libsystemd/sd-bus/bus-convenience.c:94
    #8 0x562a83aab3e1 in context_read_ntp src/timedate/timedated.c:192
    #9 0x562a83aae1af in main src/timedate/timedated.c:730
    #10 0x7f782eb238c4 in __libc_start_main (/lib64/libc.so.6+0x208c4)

Indirect leak of 77 byte(s) in 1 object(s) allocated from:
    #0 0x7f782f788f6a in realloc (/usr/lib64/libasan.so.2+0x96f6a)
    #1 0x562a83ad418a in bus_socket_read_message src/libsystemd/sd-bus/bus-socket.c:963
    #2 0x562a83ab733f in bus_read_message src/libsystemd/sd-bus/sd-bus.c:1647
    #3 0x562a83ab98ea in sd_bus_call src/libsystemd/sd-bus/sd-bus.c:2038
    #4 0x562a83b1f46d in sd_bus_call_method src/libsystemd/sd-bus/bus-convenience.c:94
    #5 0x562a83aab3e1 in context_read_ntp src/timedate/timedated.c:192
    #6 0x562a83aae1af in main src/timedate/timedated.c:730
    #7 0x7f782eb238c4 in __libc_start_main (/lib64/libc.so.6+0x208c4)

Indirect leak of 2 byte(s) in 1 object(s) allocated from:
    #0 0x7f782f75493f in strdup (/usr/lib64/libasan.so.2+0x6293f)
    #1 0x562a83b0229b in bus_message_parse_fields src/libsystemd/sd-bus/bus-message.c:5382
    #2 0x562a83ae7290 in bus_message_from_malloc src/libsystemd/sd-bus/bus-message.c:601
    #3 0x562a83ad3cad in bus_socket_make_message src/libsystemd/sd-bus/bus-socket.c:915
    #4 0x562a83ad4cfc in bus_socket_read_message src/libsystemd/sd-bus/bus-socket.c:1051
    #5 0x562a83ab733f in bus_read_message src/libsystemd/sd-bus/sd-bus.c:1647
    #6 0x562a83ab98ea in sd_bus_call src/libsystemd/sd-bus/sd-bus.c:2038
    #7 0x562a83b1f46d in sd_bus_call_method src/libsystemd/sd-bus/bus-convenience.c:94
    #8 0x562a83aab3e1 in context_read_ntp src/timedate/timedated.c:192
    #9 0x562a83aae1af in main src/timedate/timedated.c:730
    #10 0x7f782eb238c4 in __libc_start_main (/lib64/libc.so.6+0x208c4)

SUMMARY: AddressSanitizer: 1007 byte(s) leaked in 3 allocation(s).

This is due to missing  _cleanup_bus_message_unref_ in context_read_ntp()

src/timedate/timedated.c

@@ -182,7 +182,7 @@ static int context_write_data_local_rtc(Context *c) {
 
 static int context_read_ntp(Context *c, sd_bus *bus) {
         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
-        sd_bus_message *reply = NULL;
+        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
         const char *s;
         int r;