IB/qib: Remove a set-but-not-used variable

This patch avoids that a compiler warning is reported when building with
W=1.
Reviewed-by: NLeon Romanovsky <leonro@mellanox.com>
Fixes: 49c0e241 ("IB/qib: Change SDMA progression mode depending on single- or multi-rail")
Signed-off-by: NBart Van Assche <bvanassche@acm.org>
Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/qib/qib_user_sdma.c

@@ -225,8 +225,6 @@ qib_user_sdma_queue_create(struct device *dev, int unit, int ctxt, int sctxt)
 	if (sdma_rb_node) {
 		sdma_rb_node->refcount++;
 	} else {
-		int ret;
-
 		sdma_rb_node = kmalloc(sizeof(
 			struct qib_user_sdma_rb_node), GFP_KERNEL);
 		if (!sdma_rb_node)
@@ -235,8 +233,7 @@ qib_user_sdma_queue_create(struct device *dev, int unit, int ctxt, int sctxt)
 		sdma_rb_node->refcount = 1;
 		sdma_rb_node->pid = current->pid;
 
-		ret = qib_user_sdma_rb_insert(&qib_user_sdma_rb_root,
-					sdma_rb_node);
+		qib_user_sdma_rb_insert(&qib_user_sdma_rb_root, sdma_rb_node);
 	}
 	pq->sdma_rb_node = sdma_rb_node;