power: max77693: fix simple_return.cocci warnings

drivers/power/max77693_charger.c:615:1-4: WARNING: end returns can be simpified

 Simplify a trivial if-return sequence.  Possibly combine with a
 preceding function call.
Generated by: scripts/coccinelle/misc/simple_return.cocci

CC: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: NFengguang Wu <fengguang.wu@intel.com>
Reviewed-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: NSebastian Reichel <sre@kernel.org>

drivers/power/max77693_charger.c

@@ -612,12 +612,8 @@ static int max77693_reg_init(struct max77693_charger *chg)
 	if (ret)
 		return ret;
 
-	ret = max77693_set_charge_input_threshold_volt(chg,
+	return max77693_set_charge_input_threshold_volt(chg,
 			chg->charge_input_threshold_volt);
-	if (ret)
-		return ret;
-
-	return 0;
 }
 
 #ifdef CONFIG_OF