staging: rtl8723bs: hal remove the assignment to itself

Remove the assignment of variable to itself.
Assigning the variable to itself not make any difference on value.

Signed-off-by: Saurav Girepunje <saurav.girepunje@gmail.com>
Link: https://lore.kernel.org/r/YXoq2ViLxPVwAgLq@Sauravs-MacBook-Air.local


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