test/cmdline: fix memory leak

Previous change wrongly removed cmdline_free().

Fixes: 6ad06203a5 ("cmdline: free on exit")

Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Olivier Matz <olivier.matz@6wind.com>

app/test/test_cmdline_lib.c

@@ -176,6 +176,8 @@ test_cmdline_socket_fns(void)
 		printf("Error: failed to open /dev/null for reading!");
 		return -1;
 	}
+	cmdline_free(cl);
+	cl = NULL;
 
 	/* void functions */
 	cmdline_stdin_exit(NULL);