bug#69540: pre-push hook tries to check only the first ref

[Tomas Volf]

Hello,

I have noticed that despite the pre-push hook having a `while' loop to read all
the refs, it calls exec/exit on the very first one.  Effectively that means that
only the first ref is checked, the rest is assumed to be authenticated.  That
seems wrong.

Have a nice day,
Tomas Volf

--
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

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