if_spi: Fix compilation warning - unused variable

if_spi: Fix compilation warning - unused variable 'spi'

drivers/net/wireless/libertas/if_spi.c: In function ‘if_spi_init_card’:
drivers/net/wireless/libertas/if_spi.c:1035: warning: unused variable ‘spi’

The variable is used only in a macro which uses the args only for DEBUG builds.
Remove the 'spi' variable completely.
Signed-off-by: Nikanth Karthikesan <nikanth@google.com>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/libertas/if_spi.c

@@ -1032,7 +1032,6 @@ static irqreturn_t if_spi_host_interrupt(int irq, void *dev_id)
 static int if_spi_init_card(struct if_spi_card *card)
 {
 	struct lbs_private *priv = card->priv;
-	struct spi_device *spi = card->spi;
 	int err, i;
 	u32 scratch;
 	const struct firmware *helper = NULL;
@@ -1080,8 +1079,9 @@ static int if_spi_init_card(struct if_spi_card *card)
 				"attached to SPI bus_num %d, chip_select %d. "
 				"spi->max_speed_hz=%d\n",
 				card->card_id, card->card_rev,
-				spi->master->bus_num, spi->chip_select,
-				spi->max_speed_hz);
+				card->spi->master->bus_num,
+				card->spi->chip_select,
+				card->spi->max_speed_hz);
 		err = if_spi_prog_helper_firmware(card, helper);
 		if (err)
 			goto out;