platform/x86: dell-wmi: Add a comment explaining the 0xb2 magic number

The hotkey table is 0xb2, add a comment for clarity.
Suggested-by: Darren Hart <dvhart@infradead.org>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Reviewed-by: Pali Rohár <pali.rohar@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>

drivers/platform/x86/dell-wmi.c

@@ -449,6 +449,7 @@ static void __init handle_dmi_entry(const struct dmi_header *dm,
 	if (results->err || results->keymap)
 		return;		/* We already found the hotkey table. */
 
+	/* The Dell hotkey table is type 0xB2.  Scan until we find it. */
 	if (dm->type != 0xb2)
 		return;