staging: rtl8723bs: hal: Compress return logic

Simplify function returns by merging assignment and return into
one command line.
Found with Coccinelle

@@
local idexpression ret;
expression e;
@@

-ret =
+return
     e;
-return ret;

Signed-off-by: Simran Singhal <singhalsimran0@gmail.com>
Link: https://lore.kernel.org/r/20200325214312.GA1936@simran-Inspiron-5558


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