qemu/osdep: Document os_find_datadir() return value

Document os_find_datadir() returned data must be freed.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Michael Rolnik <mrolnik@gmail.com>
Tested-by: Michael Rolnik <mrolnik@gmail.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20200714164257.23330-2-f4bug@amsat.org>

os-posix.c

@@ -84,6 +84,9 @@ void os_setup_signal_handling(void)
  * Find a likely location for support files using the location of the binary.
  * When running from the build tree this will be "$bindir/../pc-bios".
  * Otherwise, this is CONFIG_QEMU_DATADIR.
+ *
+ * The caller must use g_free() to free the returned data when it is
+ * no longer required.
  */
 char *os_find_datadir(void)
 {

os-win32.c

@@ -57,7 +57,12 @@ void os_setup_early_signal_handling(void)
     atexit(os_undo_timer_resolution);
 }
 
-/* Look for support files in the same directory as the executable.  */
+/*
+ * Look for support files in the same directory as the executable.
+ *
+ * The caller must use g_free() to free the returned data when it is
+ * no longer required.
+ */
 char *os_find_datadir(void)
 {
     return qemu_get_exec_dir();