staging: r8188eu: core/rtw_recv.c: clean up nested if statements

Combine two nested if statements into a single one to fix indentation
issue and improve readability, as suggested by checkpatch.pl

Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Signed-off-by: Chang Yu <marcus.yu.56@gmail.com>
Link: https://lore.kernel.org/r/20220624144526.437322-1-marcus.yu.56@gmail.com


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