clvmd: fix memleak on exit

This patch will releases allocated private resources from
startup. Needs previous dm_zalloc patch to ensure unset
private pointer is NULL.

TODO: check on real cluster.

WHATS_NEW

@@ -1,5 +1,6 @@
 Version 2.02.106 - 
 ====================================
+  Cleanup all client resources on clvmd exit.
   Use dm_zalloc to clear members of clvmd client struct.
   Use BLKID_CFLAGS when compiling with blkid support.
   Use correct rl_completion_func_t typedef for new readline.

daemons/clvmd/clvmd.c

@@ -633,6 +633,7 @@ int main(int argc, char *argv[])
 		 * break of 'clvmd' may access already free memory here.
 		 */
 		safe_close(&(delfd->fd));
+		cmd_client_cleanup(delfd);
 		dm_free(delfd);
 	}