Input: psxpad-spi - add a check for the return value of spi_setup()

The probe function in the psxpad-spi driver calls spi_setup()
but fails to check its return value. If the SPI bus setup fails,
the driver will still load successfully, resulting in potential
error in later I/O operations.

Add a check for the return value of spi_setup() and return
an error on failure.

Fixes: 8be193c ("Input: add support for PlayStation 1/2 joypads connected via SPI")
Signed-off-by: Haotian Zhang <vulab@iscas.ac.cn>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Author: ISCAS-Vulab

drivers/input/joystick/psxpad-spi.c

@@ -344,7 +344,11 @@ static int psxpad_spi_probe(struct spi_device *spi)
 	/* (PlayStation 1/2 joypad might be possible works 250kHz/500kHz) */
 	spi->controller->min_speed_hz = 125000;
 	spi->controller->max_speed_hz = 125000;
-	spi_setup(spi);
+	err = spi_setup(spi);
+	if (err) {
+		dev_err(&spi->dev, "failed to set up SPI: %d\n", err);
+		return err;
+	}
 
 	/* pad settings */
 	psxpad_set_motor_level(pad, 0, 0);