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><td><span title='2018-12-23 16:37:51 +0200'>2018-12-23</span></td><td><a href='/guix/commit/gnu/packages/datamash.scm?id=b83ddd03d961ea0a0cf75eb6649ecec4fbd4fb94'>gnu: datamash: Update to 1.4.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-04-12 22:55:51 -0500'>2018-04-12</span></td><td><a href='/guix/commit/gnu/packages/datamash.scm?id=de7f234a3a3e583e7af832e956b44455c71dc5cb'>gnu: datamash: Fix tests on ARM systems.</a><span class='msg-avail'>...</span></td><td>Eric Bavier</td></tr>
<tr><td><span title='2018-03-18 00:02:06 +0100'>2018-03-18</span></td><td><a href='/guix/commit/gnu/packages/datamash.scm?id=80f565d3137eceb479b8f7d39c26e00385dd65f6'>gnu: datamash: Update to 1.3.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-08-24 10:35:00 +0300'>2017-08-24</span></td><td><a href='/guix/commit/gnu/packages/datamash.scm?id=c47048c328843bcc26772bd6c96d03962972b173'>gnu: datamash: Update to 1.2.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>