staging: rtl8188eu: cleanup whitespace in declarations

Replace tabs with spaces in declarations to cleanup whitespace
in rtl8188eu_recv.c.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20200723075243.21924-2-straube.linux@gmail.com


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