Use null check instead of pointer comparison #701
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The original code worked for xc8 v1.44, but does not compile with v2.45. I think the compiler failure is correct. In general, from what I understand of the C standard, it's not allowed to compare pointers unless they are to the same array or structure. I don't know how the compiler would know that and don't fully understand the reasoning for the rule, but maybe it's due to segmented memory addressing.
Anyway, the change I made should be logically equivalent; comparing both expected and actual against null rather than comparing them with each other.
Also, the comment above the change line was confusing so I re-wrote it.
This change fixes the issue I added last week, #700