sockets: Print which socket family is unsupported

It's good to know which family we've met.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

sockets.c

@@ -383,7 +383,7 @@ int dump_socket(struct fd_parms *p, int lfd, const int fdinfo)
 	case AF_PACKET:
 		return dump_one_packet_sk(p, lfd, fdinfo);
 	default:
-		pr_err("BUG! Unknown socket collected\n");
+		pr_err("BUG! Unknown socket collected (family %d)\n", family);
 		break;
 	}