spi: lpspi: Remove the unneeded result variable

Return the value pm_runtime_force_suspend() directly instead of storing
it in another redundant variable.
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: ye xingchen <ye.xingchen@zte.com.cn>
Link: https://lore.kernel.org/r/20220908010429.342875-1-ye.xingchen@zte.com.cnSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-fsl-lpspi.c

@@ -947,11 +947,8 @@ static int fsl_lpspi_remove(struct platform_device *pdev)
 
 static int __maybe_unused fsl_lpspi_suspend(struct device *dev)
 {
-	int ret;
-
 	pinctrl_pm_select_sleep_state(dev);
-	ret = pm_runtime_force_suspend(dev);
-	return ret;
+	return pm_runtime_force_suspend(dev);
 }
 
 static int __maybe_unused fsl_lpspi_resume(struct device *dev)