staging: r8188eu: Remove multiple assignments

Conform to Linux coding style.
Issue found by checkpatch:-
CHECK: multiple assignments should be avoided

Signed-off-by: Soumya Negi <soumya.negi97@gmail.com>
Link: https://lore.kernel.org/r/20220519095012.5619-1-soumya.negi97@gmail.com


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