at86rf230: remove unnecessary state read

This patch removes a unnecessary state read. The status value is never
evaluate after reading the state.

Also rename the status variable to dvdd, because this variable will be
used later.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ieee802154/at86rf230.c

@@ -969,13 +969,9 @@ static int at86rf230_irq_polarity(struct at86rf230_local *lp, int pol)
 static int at86rf230_hw_init(struct at86rf230_local *lp)
 {
 	int rc, irq_pol, irq_type;
-	u8 status;
+	u8 dvdd;
 	u8 csma_seed[2];
 
-	rc = at86rf230_read_subreg(lp, SR_TRX_STATUS, &status);
-	if (rc)
-		return rc;
-
 	rc = at86rf230_write_subreg(lp, SR_TRX_CMD, STATE_FORCE_TRX_OFF);
 	if (rc)
 		return rc;
@@ -1015,10 +1011,10 @@ static int at86rf230_hw_init(struct at86rf230_local *lp)
 	/* Wait the next SLEEP cycle */
 	msleep(100);
 
-	rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &status);
+	rc = at86rf230_read_subreg(lp, SR_DVDD_OK, &dvdd);
 	if (rc)
 		return rc;
-	if (!status) {
+	if (!dvdd) {
 		dev_err(&lp->spi->dev, "DVDD error\n");
 		return -EINVAL;
 	}