(slightly) inconsistent code in evaluate.c:type_difference

[Jonathan Neuschäfer <j.neuschaefer@xxxxxxx>]

Hello, Sparse devs,

in evaluate.c, at lines 623 and 624, t1 and t2 are expected not to be
NULL, while a few lines later (630 and 638), they are checked to avoid
a NULL pointer dereference. That's at least a bit confusing.

Thanks,
	Jonathan Neuschäfer
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