Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/mtd/nand/sh_flctl.c b/drivers/mtd/nand/sh_flctl.c
index 546c2f0..81bbb5e 100644
--- a/drivers/mtd/nand/sh_flctl.c
+++ b/drivers/mtd/nand/sh_flctl.c
@@ -78,7 +78,7 @@
 
 static void timeout_error(struct sh_flctl *flctl, const char *str)
 {
-	dev_err(&flctl->pdev->dev, "Timeout occured in %s\n", str);
+	dev_err(&flctl->pdev->dev, "Timeout occurred in %s\n", str);
 }
 
 static void wait_completion(struct sh_flctl *flctl)