[PATCH] thunderbolt: fix memdup.cocci warnings

[kernel test robot <lkp@intel.com>]

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CC: kbuild-all(a)lists.01.org
CC: Linux Memory Management List <linux-mm@kvack.org>
TO: Isaac Hazan <isaac.hazan@intel.com>
CC: Mika Westerberg <mika.westerberg@linux.intel.com>
CC: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>
CC: Andreas Noever <andreas.noever@gmail.com>
CC: Michael Jamet <michael.jamet@intel.com>
CC: Yehezkel Bernat <YehezkelShB@gmail.com>
CC: linux-usb(a)vger.kernel.org
CC: linux-kernel(a)vger.kernel.org

From: kernel test robot <lkp@intel.com>

drivers/thunderbolt/dma_test.c:302:13-20: WARNING opportunity for kmemdup

 Use kmemdup rather than duplicating its implementation

Generated by: scripts/coccinelle/api/memdup.cocci

Fixes: edc0f494ed96 ("thunderbolt: Add DMA traffic test driver")
CC: Isaac Hazan <isaac.hazan@intel.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: kernel test robot <lkp@intel.com>
---

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   14240d4c5b25d087529691ccf4d7ea256f26cfdf
commit: edc0f494ed966e39e5619be7cdaeb9873e1f4fe1 [3860/12554] thunderbolt: Add DMA traffic test driver
:::::: branch date: 9 hours ago
:::::: commit date: 4 weeks ago

Please take the patch only if it's a positive warning. Thanks!

 dma_test.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/drivers/thunderbolt/dma_test.c
+++ b/drivers/thunderbolt/dma_test.c
@@ -299,14 +299,13 @@ static int dma_test_submit_tx(struct dma
 		tf->frame.size = 0; /* means 4096 */
 		tf->dma_test = dt;
 
-		tf->data = kzalloc(DMA_TEST_FRAME_SIZE, GFP_KERNEL);
+		tf->data = kmemdup(dma_test_pattern, DMA_TEST_FRAME_SIZE,
+				   GFP_KERNEL);
 		if (!tf->data) {
 			kfree(tf);
 			return -ENOMEM;
 		}
 
-		memcpy(tf->data, dma_test_pattern, DMA_TEST_FRAME_SIZE);
-
 		dma_addr = dma_map_single(dma_dev, tf->data, DMA_TEST_FRAME_SIZE,
 					  DMA_TO_DEVICE);
 		if (dma_mapping_error(dma_dev, dma_addr)) {