mmc: sdhci-pxav2: Remove unnecessary null pointer check

There is no need to check for a null mrq->cmd in pxav1_request_done.
mmc_request_done already assumes it's not null, and it's always called
in this path by every SDHCI driver. This was caught by Smatch.
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/all/9ddaef2a-05bb-4fe7-98c5-da40a0813027@stanley.mountain/Signed-off-by: Doug Brown <doug@schmorgal.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20240714155510.48880-1-doug@schmorgal.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci-pxav2.c

@@ -126,7 +126,7 @@ static void pxav1_request_done(struct sdhci_host *host, struct mmc_request *mrq)
 	struct sdhci_pxav2_host *pxav2_host;
 
 	/* If this is an SDIO command, perform errata workaround for silicon bug */
-	if (mrq->cmd && !mrq->cmd->error &&
+	if (!mrq->cmd->error &&
 	    (mrq->cmd->opcode == SD_IO_RW_DIRECT ||
 	     mrq->cmd->opcode == SD_IO_RW_EXTENDED)) {
 		/* Reset data port */