Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index a4ceb29c..e7e72b8 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -2064,7 +2064,7 @@
 			     COMEDI_CB_OVERFLOW)) {
 		runflags_mask |= SRF_RUNNING;
 	}
-	/* remember if an error event has occured, so an error
+	/* remember if an error event has occurred, so an error
 	 * can be returned the next time the user does a read() */
 	if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) {
 		runflags_mask |= SRF_ERROR;