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/sbc7240_wdt.c b/drivers/watchdog/sbc7240_wdt.c
index 67ddeb1..ff11504 100644
--- a/drivers/watchdog/sbc7240_wdt.c
+++ b/drivers/watchdog/sbc7240_wdt.c
@@ -273,7 +273,7 @@
 
 	/* The IO port 0x043 used to disable the watchdog
 	 * is already claimed by the system timer, so we
-	 * cant request_region() it ...*/
+	 * can't request_region() it ...*/
 
 	if (timeout < 1 || timeout > SBC7240_MAX_TIMEOUT) {
 		timeout = SBC7240_TIMEOUT;