Fix memory leak in SalGtkPicker::uritounicode.

The gchars array returned by g_filename_from_uri will be copied into
the OUString sEncoded and should be freed.

Change-Id: Ib610cce5848607826632c0f5e32020708dac7645
Reviewed-on: https://gerrit.libreoffice.org/4156Reviewed-by: Noel Power <noel.power@suse.com>
Tested-by: Noel Power <noel.power@suse.com>

vcl/unx/gtk/fpicker/SalGtkPicker.cxx

@@ -60,6 +60,7 @@ OUString SalGtkPicker::uritounicode(const gchar* pIn)
         {
             OUString sEncoded(pEncodedFileName, strlen(pEncodedFileName),
                 osl_getThreadTextEncoding());
+            g_free (pEncodedFileName);
             INetURLObject aCurrentURL(sEncoded, INetURLObject::FSYS_UNX);
             aCurrentURL.SetHost(aURL.GetHost());
             sURL = aCurrentURL.getExternalURL();