extcon: max77843: Fix signedness bug in max77843_muic_set_debounce_time()

This patch fixes the variable type of 'ret' from 'unsigned int' to 'int' type
because the return type of regmap_update_bits() is 'int' type.

Fixes: 27a28d32b4f2 ('extcon: max77843: Add max77843 MUIC driver')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
[cw00.choi: Fix the patch description]
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

drivers/extcon/extcon-max77843.c

@@ -682,7 +682,7 @@ static int max77843_muic_set_debounce_time(struct max77843_muic_info *info,
 		enum max77843_muic_adc_debounce_time time)
 {
 	struct max77843 *max77843 = info->max77843;
-	unsigned int ret;
+	int ret;
 
 	switch (time) {
 	case MAX77843_DEBOUNCE_TIME_5MS: