usb: gadget: drop null test before destroy functions

Remove unneeded NULL test.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@ expression x; @@
-if (x != NULL)
  \(kmem_cache_destroy\|mempool_destroy\|dma_pool_destroy\)(x);
// </smpl>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/udc/bdc/bdc_core.c

@@ -324,7 +324,6 @@ static void bdc_mem_free(struct bdc *bdc)
 				bdc->scratchpad.buff, bdc->scratchpad.sp_dma);
 
 	/* Destroy the dma pools */
-	if (bdc->bd_table_pool)
 	dma_pool_destroy(bdc->bd_table_pool);
 
 	/* Free the bdc_ep array */

drivers/usb/gadget/udc/gr_udc.c

@@ -2117,7 +2117,6 @@ static int gr_remove(struct platform_device *pdev)
 		return -EBUSY;
 
 	gr_dfs_delete(dev);
-	if (dev->desc_pool)
 	dma_pool_destroy(dev->desc_pool);
 	platform_set_drvdata(pdev, NULL);
 

drivers/usb/gadget/udc/mv_u3d_core.c

@@ -1767,7 +1767,6 @@ static int mv_u3d_remove(struct platform_device *dev)
 	usb_del_gadget_udc(&u3d->gadget);
 
 	/* free memory allocated in probe */
-	if (u3d->trb_pool)
 	dma_pool_destroy(u3d->trb_pool);
 
 	if (u3d->ep_context)

drivers/usb/gadget/udc/mv_udc_core.c

@@ -2100,7 +2100,6 @@ static int mv_udc_remove(struct platform_device *pdev)
 	}
 
 	/* free memory allocated in probe */
-	if (udc->dtd_pool)
 	dma_pool_destroy(udc->dtd_pool);
 
 	if (udc->ep_dqh)