kernel: mem_domain: Break down assertions

Instead of composing expressions with a logical AND, break down it into
multiple assertions.  Smaller assertions are easier to read.  While at
it, compare pointers against the NULL value, and numbers against 0
instead of relying on implicit conversion to boolean-ish values.

Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
1 file changed