staging: rtl8723bs: Replace NULL pointer comparison with '!'.

Replace the comparison of 'precvbuf' to 'NULL' with '!precvbuf'.

Signed-off-by: Quytelda Kahja <quytelda@tamalin.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 file changed