staging: rtl8723bs: Fix Coverity warning in rtw_dbg_port()

Fix the following Coverity warning:

File: drivers/staging/rtl8723bs/os_dep/ioctl_linux.c in function
rtw_dbg_port():

CID 18480: Operands don't affect result (CONSTANT_EXPRESSION_RESULT)
dead_error_condition: The condition (extra_arg & 7U) > 7U cannot be true.

        if ((extra_arg & 0x07) > 0x07)
                padapter->driver_ampdu_spacing = 0xFF;
        else
                padapter->driver_ampdu_spacing = extra_arg;
Reported-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723bs/os_dep/ioctl_linux.c

@@ -3096,7 +3096,7 @@ static int rtw_dbg_port(struct net_device *dev,
 
 							DBG_871X("enable driver ctrl ampdu density = %d\n", extra_arg);
 
-							if ((extra_arg & 0x07) > 0x07)
+							if (extra_arg > 0x07)
 								padapter->driver_ampdu_spacing = 0xFF;
 							else
 								padapter->driver_ampdu_spacing = extra_arg;