Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c
index 5b9cde7..e1c8d4f 100644
--- a/drivers/tty/serial/pmac_zilog.c
+++ b/drivers/tty/serial/pmac_zilog.c
@@ -330,7 +330,7 @@
 		 * When that happens, I disable the receive side of the driver.
 		 * Note that what I've been experiencing is a real irq loop where
 		 * I'm getting flooded regardless of the actual port speed.
-		 * Something stange is going on with the HW
+		 * Something strange is going on with the HW
 		 */
 		if ((++loops) > 1000)
 			goto flood;
@@ -396,7 +396,7 @@
 		 * be nice to transmit console writes just like we normally would for
 		 * a TTY line. (ie. buffered and TX interrupt driven).  That is not
 		 * easy because console writes cannot sleep.  One solution might be
-		 * to poll on enough port->xmit space becomming free.  -DaveM
+		 * to poll on enough port->xmit space becoming free.  -DaveM
 		 */
 		if (!(status & Tx_BUF_EMP))
 			return;
@@ -809,7 +809,7 @@
 #endif /* !CONFIG_PPC_PMAC */
 
 /*
- * FixZeroBug....Works around a bug in the SCC receving channel.
+ * FixZeroBug....Works around a bug in the SCC receiving channel.
  * Inspired from Darwin code, 15 Sept. 2000  -DanM
  *
  * The following sequence prevents a problem that is seen with O'Hare ASICs