Revert "net: fix rds_iovec page count overflow"

This reverts commit bd378dd (originally
commit 1b1f693 upstream).

I messed it up in backporting it to the .32-stable kernel, so revert it
for now and try it again the next review cycle.

Cc: Thomas Pollet <thomas.pollet@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andy Grover <andy.grover@oracle.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

net/rds/rdma.c

@@ -473,14 +473,6 @@ static struct rds_rdma_op *rds_rdma_prepare(struct rds_sock *rs,
 
 		max_pages = max(nr, max_pages);
 		nr_pages += nr;
-
-		/*
-		 * nr_pages for one entry is limited to (UINT_MAX>>PAGE_SHIFT)+1,
-		 * so tot_pages cannot overflow without first going negative.
-		 */
-		if ((int)nr_pages < 0)
-			ret = -EINVAL;
-			goto out;
 	}
 
 	pages = kcalloc(max_pages, sizeof(struct page *), GFP_KERNEL);