drivers: spi_shim: add return value check

Add function return value check. This was caught by
Coverity.

Coverity-CID: 157124

Change-Id: I93b23325d657dc787300908b9117b6976617fdba
Signed-off-by: Baohong Liu <[email protected]>

Author: bliu11-intel

drivers/spi/spi_qmsi.c

@@ -229,8 +229,13 @@ static struct device *gpio_cs_init(const struct spi_qmsi_config *config)
 	if (!gpio)
 		return NULL;
 
-	gpio_pin_configure(gpio, config->cs_pin, GPIO_DIR_OUT);
-	gpio_pin_write(gpio, config->cs_pin, 1);
+	if (gpio_pin_configure(gpio, config->cs_pin, GPIO_DIR_OUT) != 0) {
+		return NULL;
+	}
+
+	if (gpio_pin_write(gpio, config->cs_pin, 1) != 0) {
+		return NULL;
+	}
 
 	return gpio;
 }