rtc: pcf2127: fix error code in pcf2127_enable_ts()

This error path accidentally returns success.  Return -EINVAL instead.

Fixes: 420cc9e ("rtc: pcf2127: add support for multiple TS functions")
Signed-off-by: Dan Carpenter <[email protected]>
Reviewed-by: Bruno Thomsen <[email protected]>
Reviewed-by: Hugo Villeneuve <[email protected]>
Reviewed-by: Hugo Villeneuve <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexandre Belloni <[email protected]>

Author: Dan Carpenter

drivers/rtc/rtc-pcf2127.c

@@ -1060,7 +1060,7 @@ static int pcf2127_enable_ts(struct device *dev, int ts_id)
 	if (pcf2127->cfg->ts[ts_id].gnd_detect_bit == 0) {
 		dev_err(dev, "%s: tamper detection to GND configuration invalid\n",
 			__func__);
-		return ret;
+		return -EINVAL;
 	}
 
 	/*