util/qemu-timer: Fix typo in description

Remove the second 'and' introduced in commit e81f86790f ("qemu-timer:
avoid checkpoints for virtual clock timers in external subsystems").

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20200811151643.21293-3-philmd@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
diff --git a/util/qemu-timer.c b/util/qemu-timer.c
index f62b4fe..878d80f 100644
--- a/util/qemu-timer.c
+++ b/util/qemu-timer.c
@@ -530,7 +530,7 @@
     }
 
     /*
-     * Extract expired timers from active timers list and and process them.
+     * Extract expired timers from active timers list and process them.
      *
      * In rr mode we need "filtered" checkpointing for virtual clock.  The
      * checkpoint must be recorded/replayed before processing any non-EXTERNAL timer,