net: fix recvfrom error message

The error is from recvfrom not sendto.

Signed-off-by: Shawn Bohrer <sbohrer@rgmadvisors.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/engines/net.c b/engines/net.c
index d5a5f36..0621cf3 100644
--- a/engines/net.c
+++ b/engines/net.c
@@ -619,7 +619,7 @@
 
 	ret = recvfrom(f->fd, (void *) &msg, sizeof(msg), MSG_WAITALL, to, &len);
 	if (ret < 0) {
-		td_verror(td, errno, "sendto udp link open");
+		td_verror(td, errno, "recvfrom udp link open");
 		return ret;
 	}