usb: cdns3: Remove the invalid comment

The function don't return value, remove the invalid comment.

Signed-off-by: Li Qiong <liqiong@nfschina.com>
Acked-by: Peter Chen <peter.chen@kernel.org>
Link: https://lore.kernel.org/r/20250314101639.424013-1-liqiong@nfschina.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>