ntb_perf: Delete duplicate dmaengine_unmap_put() call in perf_copy_chunk()

The function call “dmaengine_unmap_put(unmap)” was used in an if branch.
The same call was immediately triggered by a subsequent goto statement.
Thus avoid such a call repetition.

This issue was detected by using the Coccinelle software.

Fixes: 5648e56 ("NTB: ntb_perf: Add full multi-port NTB API support")
Cc: stable@vger.kernel.org
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Jon Mason <jdmason@kudzu.us>

Author: elfring

drivers/ntb/test/ntb_perf.c

@@ -839,10 +839,8 @@ static int perf_copy_chunk(struct perf_thread *pthr,
 	dma_set_unmap(tx, unmap);
 
 	ret = dma_submit_error(dmaengine_submit(tx));
-	if (ret) {
-		dmaengine_unmap_put(unmap);
+	if (ret)
 		goto err_free_resource;
-	}
 
 	dmaengine_unmap_put(unmap);