Attempt to allocate the htc before the backend connection,

its cheaper to eliminate the exceedingly unlikely resource leak
Coverity spotted that way.

bin/varnishd/cache/cache_backend.c

@@ -105,11 +105,18 @@ vbe_dir_getfd(const struct director *d, struct busyobj *bo)
 		return (-1);
 	}
 
+	AZ(bo->htc);
+	bo->htc = WS_Alloc(bo->ws, sizeof *bo->htc);
+	if (bo->htc == NULL)
+		/* XXX: counter ? */
+		return (-1);
+
 	FIND_TMO(connect_timeout, tmod, bo, vrt);
 	vc = VBT_Get(bp->tcp_pool, tmod);
 	if (vc == NULL) {
 		// XXX: Per backend stats ?
 		VSC_C_main->backend_fail++;
+		bo->htc = NULL;
 		return (-1);
 	}
 
@@ -129,11 +136,6 @@ vbe_dir_getfd(const struct director *d, struct busyobj *bo)
 	    vc->fd, bp->display_name, abuf2, pbuf2, abuf1, pbuf1);
 
 	vc->backend->vsc->req++;
-	AZ(bo->htc);
-	bo->htc = WS_Alloc(bo->ws, sizeof *bo->htc);
-	if (bo->htc == NULL)
-		/* XXX: counter ? */
-		return (-1);
 	INIT_OBJ(bo->htc, HTTP_CONN_MAGIC);
 	bo->htc->vbc = vc;
 	bo->htc->fd = vc->fd;