net: macb: remove superfluous logical constraint

In

	if (a > =0) {...}
	else (a < 0) {...}

the second logical constraint is superfluous.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/drivers/net/macb.c b/drivers/net/macb.c
index e62aefc..fe370bf 100644
--- a/drivers/net/macb.c
+++ b/drivers/net/macb.c
@@ -915,7 +915,7 @@
 		if (length >= 0) {
 			net_process_received_packet(packet, length);
 			reclaim_rx_buffers(macb, macb->next_rx_tail);
-		} else if (length < 0) {
+		} else {
 			return length;
 		}
 	}