[RFC PATCH power-supply] power: supply: cpcap-charger: cpcap_charger_voltage_to_regval() can be static

[kbuild test robot]

Fixes: d4ee021c410f ("power: supply: cpcap-charger: Limit voltage to 4.2V for battery")
Signed-off-by: kbuild test robot <lkp@xxxxxxxxx>
---
 cpcap-charger.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/power/supply/cpcap-charger.c b/drivers/power/supply/cpcap-charger.c
index 88bbab6e62f07..b4b7f9dc6c4ea 100644
--- a/drivers/power/supply/cpcap-charger.c
+++ b/drivers/power/supply/cpcap-charger.c
@@ -478,7 +478,7 @@ static void cpcap_charger_update_state(struct cpcap_charger_ddata *ddata,
 	dev_dbg(ddata->dev, "state: %s\n", status);
 }
 
-int cpcap_charger_voltage_to_regval(int voltage)
+static int cpcap_charger_voltage_to_regval(int voltage)
 {
 	int offset;