ch3/tcp: remove an outdated assertion

Following the fix in 806bfbf, the assertion for limiting rreq->iov
array to MPL_IOV_LIMIT no longer applies.

Author: hzhou

src/mpid/ch3/channels/nemesis/netmod/tcp/socksm.c

@@ -1535,7 +1535,6 @@ static int MPID_nem_tcp_recv_handler(sockconn_t * const sc)
         int (*reqFn) (MPIDI_VC_t *, MPIR_Request *, int *);
 
         MPIR_Assert(rreq->dev.iov_count > 0);
-        MPIR_Assert(rreq->dev.iov_count + rreq->dev.iov_offset <= MPL_IOV_LIMIT);
 
         bytes_recvd = MPL_large_readv(sc_fd, iov, rreq->dev.iov_count);
         if (bytes_recvd <= 0) {