[PATCH] linux: mips: Fix getdents64 fallback on mips64-n32

[Florian Weimer]

* Adhemerval Zanella:

> Indeed, I fixed on the patch below.  The tst-getdents64 does pass on 
> mips64 and mips64-n32 on gccfarm machine (I explicit disabled the
> getdents64 call for the test).

This version looks okay to me.

Thanks,
Florian
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