transport: Use a direct return to reduce branching

Save ourselves from the mental gymnastics of the break statement.

Change-Id: Ib58717b7abe4416e2788d8ce3d03b6317c94ee39
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
diff --git a/src/transport/transport.c b/src/transport/transport.c
index 8f95cd1..d80e90e 100644
--- a/src/transport/transport.c
+++ b/src/transport/transport.c
@@ -209,7 +209,7 @@
 		ret = pldm_transport_poll(transport,
 					  (int)(timeval_to_msec(&remaining)));
 		if (ret <= 0) {
-			break;
+			return PLDM_REQUESTER_RECV_FAIL;
 		}
 
 		pldm_tid_t src_tid;