printsock: do not fetch sockaddr.sa_data twice

* net.c (printsock): Print addrbuf.sa.sa_data using print_quoted_string.
diff --git a/net.c b/net.c
index b9733a0..e6e081d 100644
--- a/net.c
+++ b/net.c
@@ -398,8 +398,8 @@
 
 	default:
 		tprints("sa_data=");
-		printstr(tcp, (long) &((struct sockaddr *) addr)->sa_data,
-			sizeof addrbuf.sa.sa_data);
+		print_quoted_string(addrbuf.sa.sa_data,
+				    sizeof(addrbuf.sa.sa_data), 0);
 		break;
 	}
 	tprints("}");