qemu/timer: Clarify timer_new*() must be freed with timer_free()

There was not mention QEMUTimer created with timer_new*() must
be released with timer_free() instead of g_free(), because then
active timers are removed from the active list. Update the
documentation mentioning timer_free().

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

include/qemu/timer.h

@@ -507,6 +507,8 @@ static inline void timer_init_ms(QEMUTimer *ts, QEMUClockType type,
  * with an AioContext---each of them runs its timer callbacks in its own
  * AioContext thread.
  *
+ * The timer returned must be freed using timer_free().
+ *
  * Returns: a pointer to the timer
  */
 static inline QEMUTimer *timer_new_full(QEMUTimerListGroup *timer_list_group,
@@ -530,6 +532,8 @@ static inline QEMUTimer *timer_new_full(QEMUTimerListGroup *timer_list_group,
  * and associate it with the default timer list for the clock type @type.
  * See timer_new_full for details.
  *
+ * The timer returned must be freed using timer_free().
+ *
  * Returns: a pointer to the timer
  */
 static inline QEMUTimer *timer_new(QEMUClockType type, int scale,
@@ -548,6 +552,8 @@ static inline QEMUTimer *timer_new(QEMUClockType type, int scale,
  * associated with the clock.
  * See timer_new_full for details.
  *
+ * The timer returned must be freed using timer_free().
+ *
  * Returns: a pointer to the newly created timer
  */
 static inline QEMUTimer *timer_new_ns(QEMUClockType type, QEMUTimerCB *cb,
@@ -566,6 +572,8 @@ static inline QEMUTimer *timer_new_ns(QEMUClockType type, QEMUTimerCB *cb,
  * associated with the clock.
  * See timer_new_full for details.
  *
+ * The timer returned must be freed using timer_free().
+ *
  * Returns: a pointer to the newly created timer
  */
 static inline QEMUTimer *timer_new_us(QEMUClockType type, QEMUTimerCB *cb,
@@ -584,6 +592,8 @@ static inline QEMUTimer *timer_new_us(QEMUClockType type, QEMUTimerCB *cb,
  * associated with the clock.
  * See timer_new_full for details.
  *
+ * The timer returned must be freed using timer_free().
+ *
  * Returns: a pointer to the newly created timer
  */
 static inline QEMUTimer *timer_new_ms(QEMUClockType type, QEMUTimerCB *cb,