Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/net/wireless/p54/p54spi.c b/drivers/net/wireless/p54/p54spi.c
index 7ecc0bd..6d9204fe 100644
--- a/drivers/net/wireless/p54/p54spi.c
+++ b/drivers/net/wireless/p54/p54spi.c
@@ -287,7 +287,7 @@
 	enable_irq(gpio_to_irq(p54spi_gpio_irq));
 
 	/*
-	 * need to wait a while before device can be accessed, the lenght
+	 * need to wait a while before device can be accessed, the length
 	 * is just a guess
 	 */
 	msleep(10);