staging: rtl8188eu: cleanup long line in fw.c

Add line break to avoid line length over 80 characters.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20200413175957.30165-3-straube.linux@gmail.com


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