drbd: _drbd_send_cmd(): Return 0 upon success and an error code otherwise

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index ff0085b..2177915 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -827,7 +827,7 @@
 		if (apv >= 89)
 			strcpy(p->csums_alg, mdev->tconn->net_conf->csums_alg);
 
-		rv = _drbd_send_cmd(mdev, sock, cmd, &p->head, size, 0);
+		rv = !_drbd_send_cmd(mdev, sock, cmd, &p->head, size, 0);
 	} else
 		rv = 0; /* not ok */
 
@@ -995,9 +995,8 @@
 	p.state = cpu_to_be32(mdev->state.i); /* Within the send mutex */
 	sock = mdev->tconn->data.socket;
 
-	if (likely(sock != NULL)) {
-		ok = _drbd_send_cmd(mdev, sock, P_STATE, &p.head, sizeof(p), 0);
-	}
+	if (likely(sock != NULL))
+		ok = !_drbd_send_cmd(mdev, sock, P_STATE, &p.head, sizeof(p), 0);
 
 	mutex_unlock(&mdev->tconn->data.mutex);
 
@@ -1150,8 +1149,8 @@
 
 	if (len) {
 		DCBP_set_code(p, RLE_VLI_Bits);
-		ok = _drbd_send_cmd(mdev, mdev->tconn->data.socket, P_COMPRESSED_BITMAP, h,
-			sizeof(*p) + len, 0);
+		ok = !_drbd_send_cmd(mdev, mdev->tconn->data.socket, P_COMPRESSED_BITMAP, h,
+				     sizeof(*p) + len, 0);
 
 		c->packets[0]++;
 		c->bytes[0] += sizeof(*p) + len;
@@ -1165,8 +1164,8 @@
 		len = num_words * sizeof(long);
 		if (len)
 			drbd_bm_get_lel(mdev, c->word_offset, num_words, (unsigned long*)h->payload);
-		ok = _drbd_send_cmd(mdev, mdev->tconn->data.socket, P_BITMAP,
-				   h, sizeof(struct p_header80) + len, 0);
+		ok = !_drbd_send_cmd(mdev, mdev->tconn->data.socket, P_BITMAP,
+				     h, sizeof(struct p_header80) + len, 0);
 		c->word_offset += num_words;
 		c->bit_offset = c->word_offset * BITS_PER_LONG;