RDS: Do not BUG() on error returned from ib_post_send

BUGging on a runtime error code should be avoided. This
patch also eliminates all other BUG()s that have no real
reason to exist.

Signed-off-by: Andy Grover <andy.grover@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/rds/iw_send.c b/net/rds/iw_send.c
index 1379e9d..52182ff 100644
--- a/net/rds/iw_send.c
+++ b/net/rds/iw_send.c
@@ -616,8 +616,7 @@
 		rds_iw_send_grab_credits(ic, 0, &posted, 1, RDS_MAX_ADV_CREDIT - adv_credits);
 		adv_credits += posted;
 		BUG_ON(adv_credits > 255);
-	} else if (ic->i_rm != rm)
-		BUG();
+	}
 
 	send = &ic->i_sends[pos];
 	first = send;