drivers/spi: Check return value for error handling

Coverity detects calling function spi_sdcard_do_command without checking
return value. Fix this issue by checking return value for error
handling.

Found-by: Coverity CID 1407737
TEST=None

Signed-off-by: John Zhao <john.zhao@intel.com>
Change-Id: Ie0d28806b5c0b4c6d509e583d115358864eeff80
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45620
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/drivers/spi/spi_sdcard.c

@@ -354,7 +354,9 @@ static int spi_sdcard_do_app_command(const struct spi_sdcard *card,
 		uint32_t *out_register)
 {
 	/* CMD55 */
-	spi_sdcard_do_command(card, APP_CMD, 0, NULL);
+	if (spi_sdcard_do_command(card, APP_CMD, 0, NULL))
+		return -1;
+
 	return spi_sdcard_do_command_help(card, 1, cmd, argument, out_register);
 }