Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/watchdog/sp805_wdt.c b/drivers/watchdog/sp805_wdt.c
index 0a0efe7..0d80e08 100644
--- a/drivers/watchdog/sp805_wdt.c
+++ b/drivers/watchdog/sp805_wdt.c
@@ -90,7 +90,7 @@
 	/*
 	 * sp805 runs counter with given value twice, after the end of first
 	 * counter it gives an interrupt and then starts counter again. If
-	 * interrupt already occured then it resets the system. This is why
+	 * interrupt already occurred then it resets the system. This is why
 	 * load is half of what should be required.
 	 */
 	load = div_u64(rate, 2) * timeout - 1;