RDMA/cxgb3: Fix uninitialized variable

The variable npages might be used uninitialized.
Signed-off-by: NCong Ding <dinggnu@gmail.com>
Acked-by: NSteve Wise <swise@opengridcomputing.com>
Signed-off-by: NRoland Dreier <roland@purestorage.com>

drivers/infiniband/hw/cxgb3/iwch_provider.c

@@ -559,7 +559,7 @@ static int iwch_reregister_phys_mem(struct ib_mr *mr,
 	__be64 *page_list = NULL;
 	int shift = 0;
 	u64 total_size;
-	int npages;
+	int npages = 0;
 	int ret;
 
 	PDBG("%s ib_mr %p ib_pd %p\n", __func__, mr, pd);