staging: rtl8723bs: simplify return checks in validate_recv_data_frame()

staging: rtl8723bs: simplify return checks in validate_recv_data_frame()

Combine the return value checks for _FAIL and RTW_RX_HANDLED into a
single logical OR statement and remove unnecessary braces. This improves
code readability and resolves the following checkpatch.pl warning:
"WARNING: braces {} are not necessary for any arm of this statement"

Signed-off-by: Giacomo Di Clerico <giacomodiclerico@gmail.com>
Link: https://patch.msgid.link/20260317100723.72476-1-giacomodiclerico@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>