Initialize the context in 'test_auth_clear'.
Fixes the test suite on mips64el.

Patch by Mark H Weaver <mhw@netris.org>

--- libotr-4.1.1/tests/unit/test_auth.c.orig	2015-12-25 12:39:45.000000000 -0500
+++ libotr-4.1.1/tests/unit/test_auth.c	2016-03-17 18:53:10.169999706 -0400
@@ -67,6 +67,7 @@
 	OtrlAuthInfo *auth = &ctx.auth;
 
 	/* API call. */
+	otrl_auth_new(&ctx);
 	otrl_auth_clear(auth);
 
 	ok(auth->authstate == OTRL_AUTHSTATE_NONE &&
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<tr class='logheader'><td><span title='2022-08-30 00:40:04 +0200'>2022-08-30</span></td><td class='logsubject'><a href='/guix/commit/gnu/services.scm?id=9096bc28a30d48486efa13488ac4814b2ccd0fa2'>services: provenance: Use 'current-channels' to obtain provenance data.</a></td><td>Ludovic Courtès</td></tr>
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Previously, build-time metadata from (guix config) would be ignored when
available--e.g., when running /run/current-system/profile/bin/guix.

This is a followup to 316fc2acbb112bfa572ae30f95a93bcd56621234.

* gnu/services.scm (provenance-entry): Use 'current-channels' instead of
'current-profile' + 'profile-channels'.


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