ceph: messenger: check prepare_write_connect() result

(cherry picked from commit 5a0f8fdd)

prepare_write_connect() can return an error, but only one of its
callers checks for it.  All the rest are in functions that already
return errors, so it should be fine to return the error if one
gets returned.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

net/ceph/messenger.c

@@ -1409,7 +1409,9 @@ static int process_connect(struct ceph_connection *con)
 		       ceph_pr_addr(&con->peer_addr.in_addr));
 		reset_connection(con);
 		ceph_con_out_kvec_reset(con);
-		prepare_write_connect(con);
+		ret = prepare_write_connect(con);
+		if (ret < 0)
+			return ret;
 		prepare_read_connect(con);
 
 		/* Tell ceph about it. */
@@ -1433,7 +1435,9 @@ static int process_connect(struct ceph_connection *con)
 		     le32_to_cpu(con->in_connect.connect_seq));
 		con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
 		ceph_con_out_kvec_reset(con);
-		prepare_write_connect(con);
+		ret = prepare_write_connect(con);
+		if (ret < 0)
+			return ret;
 		prepare_read_connect(con);
 		break;
 
@@ -1448,7 +1452,9 @@ static int process_connect(struct ceph_connection *con)
 		get_global_seq(con->msgr,
 			       le32_to_cpu(con->in_connect.global_seq));
 		ceph_con_out_kvec_reset(con);
-		prepare_write_connect(con);
+		ret = prepare_write_connect(con);
+		if (ret < 0)
+			return ret;
 		prepare_read_connect(con);
 		break;
 
@@ -1854,7 +1860,9 @@ static int try_write(struct ceph_connection *con)
 	if (con->sock == NULL) {
 		ceph_con_out_kvec_reset(con);
 		prepare_write_banner(con);
-		prepare_write_connect(con);
+		ret = prepare_write_connect(con);
+		if (ret < 0)
+			goto out;
 		prepare_read_banner(con);
 		set_bit(CONNECTING, &con->state);
 		clear_bit(NEGOTIATING, &con->state);