hlr.c: free root talloc context on exit

This makes both ASAN and Valgrind happy, because they do expect
all allocated heap chunks to be released on exit.

Change-Id: I7345dec8d06b0b71a859c16132dc0008cfe17cba

src/hlr.c

@@ -625,7 +625,12 @@ int main(int argc, char **argv)
 	db_close(g_hlr->dbc);
 	log_fini();
 
+	/**
+	 * Report the heap state of root context, then free,
+	 * so both ASAN and Valgrind are happy...
+	 */
 	talloc_report_full(hlr_ctx, stderr);
+	talloc_free(hlr_ctx);
 
 	return 0;
 }