mailbox: Fix a couple of trivial static checker issues

This patch deals with a few spelling, white space and type
warnings reported by Intel's Kbuild Test Robot.
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

drivers/mailbox/mailbox-sti.c

@@ -64,7 +64,7 @@ struct sti_mbox_device {
 };
 
 /**
- * STi Mailbox platform specfic configuration
+ * STi Mailbox platform specific configuration
  *
  * @num_inst:	Maximum number of instances in one HW Mailbox
  * @num_chan:	Maximum number of channel per instance

drivers/mailbox/mailbox-test.c

@@ -30,7 +30,7 @@ static struct dentry *root_debugfs_dir;
 
 struct mbox_test_device {
 	struct device		*dev;
-	void __iomem		*mmio;
+	void			*mmio;
 	struct mbox_chan	*tx_channel;
 	struct mbox_chan	*rx_channel;
 	char			*rx_buffer;
@@ -53,7 +53,7 @@ static ssize_t mbox_test_signal_write(struct file *filp,
 
 	if (count > MBOX_MAX_SIG_LEN) {
 		dev_err(tdev->dev,
-			"Signal length %d greater than max allowed %d\n",
+			"Signal length %zd greater than max allowed %d\n",
 			count, MBOX_MAX_SIG_LEN);
 		return -EINVAL;
 	}
@@ -92,7 +92,7 @@ static ssize_t mbox_test_message_write(struct file *filp,
 
 	if (count > MBOX_MAX_MSG_LEN) {
 		dev_err(tdev->dev,
-			"Message length %d greater than max allowed %d\n",
+			"Message length %zd greater than max allowed %d\n",
 			count, MBOX_MAX_MSG_LEN);
 		return -EINVAL;
 	}
@@ -303,7 +303,7 @@ static int mbox_test_probe(struct platform_device *pdev)
 	tdev->tx_channel = mbox_test_request_channel(pdev, "tx");
 	tdev->rx_channel = mbox_test_request_channel(pdev, "rx");
 
-	if (!tdev->tx_channel && !tdev->tx_channel)
+	if (!tdev->tx_channel && !tdev->rx_channel)
 		return -EPROBE_DEFER;
 
 	tdev->dev = &pdev->dev;