[Aarch64] Fix _lseek prototype

[Eric Blake]

On 10/5/18 4:21 AM, Christophe Lyon wrote:
> Here is an updated version using "off_t" instead of "int".
> OK?
> 

> -int _lseek (int, int, int);
> +off_t _lseek (int, int, int);

Per POSIX, the primary function is off_t lseek(int, off_t, int). It 
looks weird that your _lseek uses int instead of off_t offset. Is this 
code only ever used on a 32-bit platform, where off_t will never be a 
64-bit type?  And since this is '_lseek' rather than 'lseek,' it might 
be okay to have a different signature than POSIX.  Even so, it's still 
better to use off_t consistently, rather than in 1/2 of the places where 
it is typically used.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
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