staging: rtl8723bs: remove unneeded variables

Remove unneeded temporary local variables and their declarations.

Signed-off-by: Payal Kshirsagar <payalskshirsagar1234@gmail.com>
Link: https://lore.kernel.org/r/20200321074757.8321-1-payalskshirsagar1234@gmail.com


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