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/olpc_dcon/olpc_dcon_xo_1.c b/drivers/staging/olpc_dcon/olpc_dcon_xo_1.c
index b154be7..b5d21f6 100644
--- a/drivers/staging/olpc_dcon/olpc_dcon_xo_1.c
+++ b/drivers/staging/olpc_dcon/olpc_dcon_xo_1.c
@@ -80,7 +80,7 @@
 	lob &= ~(1 << DCON_IRQ);
 	outb(lob, 0x4d0);
 
-	/* Register the interupt handler */
+	/* Register the interrupt handler */
 	if (request_irq(DCON_IRQ, &dcon_interrupt, 0, "DCON", dcon)) {
 		printk(KERN_ERR "olpc-dcon: failed to request DCON's irq\n");
 		goto err_req_irq;