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/gadget/printer.c b/drivers/usb/gadget/printer.c
index 12ff6cff..c3f2bd4 100644
--- a/drivers/usb/gadget/printer.c
+++ b/drivers/usb/gadget/printer.c
@@ -126,7 +126,7 @@
 #define PRINTER_VENDOR_NUM	0x0525		/* NetChip */
 #define PRINTER_PRODUCT_NUM	0xa4a8		/* Linux-USB Printer Gadget */
 
-/* Some systems will want different product identifers published in the
+/* Some systems will want different product identifiers published in the
  * device descriptor, either numbers or strings or both.  These string
  * parameters are in UTF-8 (superset of ASCII's 7 bit characters).
  */