transport: af-mctp: Organise variable declarations in *_recv()

Align more closely with kernel-style C where we can.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: Ic40d0801fbfd3fde4ad4955903cb90265b6fe4b4
diff --git a/src/transport/af-mctp.c b/src/transport/af-mctp.c
index fa8ba2e..8c09658 100644
--- a/src/transport/af-mctp.c
+++ b/src/transport/af-mctp.c
@@ -86,21 +86,26 @@
 {
 	struct pldm_transport_af_mctp *af_mctp = transport_to_af_mctp(t);
 	mctp_eid_t eid = 0;
-	int rc = pldm_transport_af_mctp_get_eid(af_mctp, tid, &eid);
+	ssize_t length;
+	int rc;
+
+	rc = pldm_transport_af_mctp_get_eid(af_mctp, tid, &eid);
 	if (rc) {
 		return PLDM_REQUESTER_RECV_FAIL;
 	}
 
-	ssize_t length = recv(af_mctp->socket, NULL, 0, MSG_PEEK | MSG_TRUNC);
+	length = recv(af_mctp->socket, NULL, 0, MSG_PEEK | MSG_TRUNC);
 	if (length <= 0) {
 		return PLDM_REQUESTER_RECV_FAIL;
 	}
+
 	*pldm_msg = malloc(length);
 	length = recv(af_mctp->socket, *pldm_msg, length, MSG_TRUNC);
 	if (length < (ssize_t)sizeof(struct pldm_msg_hdr)) {
 		free(*pldm_msg);
 		return PLDM_REQUESTER_INVALID_RECV_LEN;
 	}
+
 	*msg_len = length;
 
 	return PLDM_REQUESTER_SUCCESS;