[PATCH] src/ext4_resize.c: set errno to 0 before the strtoull call

[Andreas Schwab]

On Jan 18 2022, H.J. Lu via Libc-alpha wrote:

>> Something like:
>>
>>          errno = 0; /* must be cleared to distinguish error */
> ^^^^^^^^^^^^^^^^^ Remove it.

You cannot remove that.  strtoull will not modify errno when there is no
error, so if you want to distinguish a valid return value from an
erroneous one you need to clear errno before the call.

https://pubs.opengroup.org/onlinepubs/9699919799/functions/strtoul.html

    Since 0, {ULONG_MAX}, and {ULLONG_MAX} are returned on error and are
    also valid returns on success, an application wishing to check for error
    situations should set errno to 0, then call strtoul() or strtoull(),
    then check errno.

-- 
Andreas Schwab, schwab@linux-m68k.org
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