drivers: sdhc: renesas_ra: remove dead error check

Remove a dead error check which check ret but ret wasn't even
assigned before the test.

Remove the useless condition to make the intent explicit and clean
up the code.

Signed-off-by: Gaetan Perrot <gaetan.perrot@spacecubics.com>

Author: moonlight83340

drivers/sdhc/sdhc_renesas_ra.c

@@ -193,10 +193,6 @@ static int sdhc_ra_request(const struct device *dev, struct sdhc_command *cmd,
 	/* Reset semaphore */
 	k_sem_reset(&priv->sdmmc_event.transfer_sem);
 	k_sem_take(&priv->thread_lock, K_FOREVER);
-	if (ret < 0) {
-		LOG_ERR("Can not take sem!");
-		goto end;
-	}
 
 	/*
 	 * Handle opcode with RA specifics