[PATCH] Make Lck_AssertHeld trigger in the caller code

[Dridi Boukelmoune]

Hi,

With Varnish locks available for VMODs in 4.1 I decided to convert my
plain pthread locks on my 4.1-only module. I even found a place where
I forgot a lock thanks to being able to assert on it being held :)

This patch aims at making this assertion a bit more useful:

Assert error in Lck__Assert(), cache/cache_lck.c line 175:
Condition(ilck->held) not true.

The backtrace doesn't mention static function names or line numbers,
so with the patch I got this instead:

Assert error in vmod_dns_del(), vmod_named.c line 231:
Condition(Lck__Held(&dir->mtx)) not true.

Best,
Dridi
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