Memory leak in initialize_automatic_p11_kit()

[Sam Varshavchik]

Valgrind is complaining about a minor memory leak. Looks like it's happening  
only once, on initialization. But, it's still a leak.

==21602==    at 0x4A074CD: malloc (vg_replace_malloc.c:236)
==21602==    by 0x33D4486A81: strdup (in /lib64/libc-2.14.90.so)
==21602==    by 0x33DB805907: p11_kit_registered_module_to_name (in /usr/lib64/libp11-kit.so.0.0.0)
==21602==    by 0x3F70C48524: gnutls_pkcs11_init (in /usr/lib64/libgnutls.so.26.21.8)

Looking at the code, p11_kit_registered_module_to_name() returns a malloced  
buffer, which the caller seems to be responsible for freeing, and  
initialize_automatic_p11_kit() does not do that.

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