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/sunzilog.c b/drivers/tty/serial/sunzilog.c
index 99ff9ab..8e916e7 100644
--- a/drivers/tty/serial/sunzilog.c
+++ b/drivers/tty/serial/sunzilog.c
@@ -474,7 +474,7 @@
 		 * 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;