treewide: Fix typos in various parts of the kernel, and fix some comments.

The below patch fixes some typos in various parts of the kernel, as well as fixes some comments.
Please let me know if I missed anything, and I will try to get it changed and resent.

Signed-off-by: Justin P. Mattock <justinmattock@gmail.com>
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/net/irda/via-ircc.c b/drivers/net/irda/via-ircc.c
index 6d64790..2d456dd 100644
--- a/drivers/net/irda/via-ircc.c
+++ b/drivers/net/irda/via-ircc.c
@@ -942,14 +942,14 @@
 	iobase = self->io.fir_base;
 	/* Disable DMA */
 //      DisableDmaChannel(self->io.dma);
-	/* Check for underrrun! */
+	/* Check for underrun! */
 	/* Clear bit, by writing 1 into it */
 	Tx_status = GetTXStatus(iobase);
 	if (Tx_status & 0x08) {
 		self->netdev->stats.tx_errors++;
 		self->netdev->stats.tx_fifo_errors++;
 		hwreset(self);
-// how to clear underrrun ?
+	/* how to clear underrun? */
 	} else {
 		self->netdev->stats.tx_packets++;
 		ResetChip(iobase, 3);