staging: rtl8188eu: core: rtw_mlme: Remove return variables.

The last two lines in the function could
be compressed into one. Avoid usage of local variable.
Issue found with Coccinelle using ret.cocci.

Signed-off-by: Sanjana Sanikommu <sanjana99reddy99@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>