[PATCH]Memory leak in classid.c

[Nicolas CARRIER]

Hello,
I'm using libnl in a program which I give to valgrind in order to track memory errors / leaks.
When my program exits, it complains about non-freed memory, allocated in 3 places in classid.c, at lines 280, 284 and 289.

It seems related to the module's constructor classid_init which allocates resources, with no destructor to free it.

The attached patch tries to fix this issue by registering a destructor which performs the tree liberation at exit.
-- 
Nicolas CARRIER - 6081 - 2ème centre
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