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Plus some other small fixes nearby.
* lisp/hexl.el (hexl-end-of-line): Simplify to match next fix.
(hexl-end-of-1k-page, hexl-end-of-512b-page): Use min instead
of max.  Tiny change by Vladimir Nikishkin (Bug#39131).
(hexl-insert-char): Use = instead of eq to compare integers.