misc: bcm-vk: fix set_q_num API precedence issue

Change set_q_num API to use if-else to make it more explicit,
and avoid a precedence rule issue.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Desmond Yan <desmond.yan@broadcom.com>
Signed-off-by: Scott Branden <scott.branden@broadcom.com>
Link: https://lore.kernel.org/r/20210129060403.14801-1-scott.branden@broadcom.com


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