staging: rtl8723bs: remove redundant assignment to ret

Variable ret is initialized to a value that is never read and it is
re-assigned later. The initialization is redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20190813124838.1317-1-colin.king@canonical.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723bs/core/rtw_io.c

@@ -142,7 +142,7 @@ u32 _rtw_write_port(struct adapter *adapter, u32 addr, u32 cnt, u8 *pmem)
 	u32 (*_write_port)(struct intf_hdl *pintfhdl, u32 addr, u32 cnt, u8 *pmem);
 	struct io_priv *pio_priv = &adapter->iopriv;
 	struct	intf_hdl		*pintfhdl = &(pio_priv->intf);
-	u32 ret = _SUCCESS;
+	u32 ret;
 
 	_write_port = pintfhdl->io_ops._write_port;