staging: iio: accel: add error check

Go to error_ret if sca3000_read_ctrl_reg() failed.
Signed-off-by: Luis de Bethencourt <luisbg@osg.samsung.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/staging/iio/accel/sca3000_core.c

@@ -1046,6 +1046,8 @@ static int sca3000_clean_setup(struct sca3000_state *st)
 
 	/* Disable ring buffer */
 	ret = sca3000_read_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL);
+	if (ret < 0)
+		goto error_ret;
 	ret = sca3000_write_ctrl_reg(st, SCA3000_REG_CTRL_SEL_OUT_CTRL,
 				     (ret & SCA3000_OUT_CTRL_PROT_MASK)
 				     | SCA3000_OUT_CTRL_BUF_X_EN