ionic: clarify boolean precedence

Add parenthesis to clarify a boolean usage.

Pointed out in https://lore.kernel.org/lkml/202008060413.VgrMuqLJ%25lkp@intel.com/



Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>