<p>Just <code>memset()</code> this to <code>0</code>.</p>
<p>Without this kamailio segfaults when running <code>fparam_free_restore()</code> on a variable that contains transformations immediately after creation, because field <code>next</code> of the transformation contains garbage.</p>
<p>In my case this was variable which contained <code>re.subst</code> transformation. And below is the top of the backtrace.</p>
<pre><code>#0  0x00000000005cba17 in tr_param_free (tp=0x292873257325203a) at core/pvapi.c:1804
#1  0x00000000005cb677 in tr_destroy (t=0x7f6387ed0c40) at core/pvapi.c:1742
#2  0x00000000005cb9c1 in tr_free (t=0x0) at core/pvapi.c:1786
#3  0x00000000005ca194 in pv_spec_destroy (spec=0x7f6387ed0b80) at core/pvapi.c:1570
#4  0x00000000005ca1b7 in pv_spec_free (spec=0x7f6387ed0b80) at core/pvapi.c:1578
#5  0x0000000000541820 in fparam_free_contents (fp=0x7f6387ed0ae0) at core/sr_module.c:1334
#6  0x0000000000541898 in fparam_free_restore (param=0x7f6387ed1168) at core/sr_module.c:1364
</code></pre>


<h4>Pre-Submission Checklist</h4>



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<h4>Description</h4>


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<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/kamailio/kamailio/pull/1506'>https://github.com/kamailio/kamailio/pull/1506</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>properly initialize new tr_param_t object</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/kamailio/kamailio/pull/1506/files#diff-0">src/modules/textops/txt_var.c</a>
    (1)
  </li>
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<h4>Patch Links:</h4>
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  <li><a href='https://github.com/kamailio/kamailio/pull/1506.patch'>https://github.com/kamailio/kamailio/pull/1506.patch</a></li>
  <li><a href='https://github.com/kamailio/kamailio/pull/1506.diff'>https://github.com/kamailio/kamailio/pull/1506.diff</a></li>
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