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/hvc/hvc_iucv.c b/drivers/tty/hvc/hvc_iucv.c
index c3425bb..b6f7d52 100644
--- a/drivers/tty/hvc/hvc_iucv.c
+++ b/drivers/tty/hvc/hvc_iucv.c
@@ -255,7 +255,7 @@
 		default:
 			written = -EIO;
 		}
-		/* remove buffer if an error has occured or received data
+		/* remove buffer if an error has occurred or received data
 		 * is not correct */
 		if (rc || (rb->mbuf->version != MSG_VERSION) ||
 			  (rb->msg.length    != MSG_SIZE(rb->mbuf->datalen)))
@@ -620,7 +620,7 @@
  *		the index of an struct hvc_iucv_private instance.
  *
  * This routine notifies the HVC back-end that a tty hangup (carrier loss,
- * virtual or otherwise) has occured.
+ * virtual or otherwise) has occurred.
  * The z/VM IUCV HVC device driver ignores virtual hangups (vhangup())
  * to keep an existing IUCV communication path established.
  * (Background: vhangup() is called from user space (by getty or login) to