nlist_ecoff still broken on mips

[Paul Goyette <paul%whooppee.com@localhost>]

--- nlist_ecoff.ln ---
/build/netbsd-local/src/lib/libc/gen/nlist_ecoff.c(109): warning: 
constant in conditional context [161]

...
61  #define check(off, size)        ((off < 0) || (off + size > mappedsize))
...
109         if (check(0, sizeof *exechdrp))
110                 goto unmap;
...


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