[PATCH] VSL_Arg rejects -L 0

[Geoff Simmons]

Hello all,

Currently a VSL tool such as varnishlog crashes with the option -L 0
when the first transaction is read -- AN(vtx) in vsl_dispatch.c, since
the vslq->incomplete list is empty.

Transaction limit 0 doesn't make any sense, so this patch enforces -L > 0.


Best,
Geoff
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