[PATCH] macintosh/windfarm: Make symbol 'pm121_sys_state' static

The sparse tool complains as follows:

drivers/macintosh/windfarm_pm121.c:436:24: warning:
 symbol 'pm121_sys_state' was not declared. Should it be static?

This symbol is not used outside of windfarm_pm121.c, so this
commit marks it static.

Reported-by: Hulk Robot <redacted>
Signed-off-by: Yu Kuai <redacted>
---
 drivers/macintosh/windfarm_pm121.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/macintosh/windfarm_pm121.c b/drivers/macintosh/windfarm_pm121.c
index ab467b9c31be..ba1ec6fc11d2 100644
--- a/drivers/macintosh/windfarm_pm121.c
+++ b/drivers/macintosh/windfarm_pm121.c

@@ -433,7 +433,7 @@ struct pm121_sys_state {
 	struct wf_pid_state	pid;
 };
 
-struct pm121_sys_state *pm121_sys_state[N_LOOPS] = {};
+static struct pm121_sys_state *pm121_sys_state[N_LOOPS] = {};
 
 /*
  * ****** CPU Fans Control Loop ******

-- 
2.25.4