Blackfin arch: request_dma() returns 0 on success, not channel

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

arch/blackfin/kernel/bfin_dma_5xx.c

@@ -135,7 +135,7 @@ int request_dma(unsigned int channel, const char *device_id)
 	 * descriptor/channel
 	 */
 	pr_debug("request_dma() : END  \n");
-	return channel;
+	return 0;
 }
 EXPORT_SYMBOL(request_dma);