mfd: rtsx: Simplify function return logic

The invoked functions already return zero on success or a negative
errno code so there is no need to open code the logic in the caller.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/drivers/mfd/rts5249.c b/drivers/mfd/rts5249.c
index eb2d586..40f8bb1 100644
--- a/drivers/mfd/rts5249.c
+++ b/drivers/mfd/rts5249.c
@@ -234,11 +234,7 @@
 			SD_POWER_MASK, SD_VCC_POWER_ON);
 	rtsx_pci_add_cmd(pcr, WRITE_REG_CMD, PWR_GATE_CTRL,
 			LDO3318_PWR_MASK, 0x06);
-	err = rtsx_pci_send_cmd(pcr, 100);
-	if (err < 0)
-		return err;
-
-	return 0;
+	return rtsx_pci_send_cmd(pcr, 100);
 }
 
 static int rtsx_base_card_power_off(struct rtsx_pcr *pcr, int card)