Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c
index d843491..0aac00a 100644
--- a/drivers/usb/serial/io_ti.c
+++ b/drivers/usb/serial/io_ti.c
@@ -433,7 +433,7 @@
 
 	/* We can only send a maximum of 1 aligned byte page at a time */
 
-	/* calulate the number of bytes left in the first page */
+	/* calculate the number of bytes left in the first page */
 	write_length = EPROM_PAGE_SIZE -
 				(start_address & (EPROM_PAGE_SIZE - 1));