dmatest: fix max channels handling

The check for reaching max_channels is short circuited by 'continuing'
after successfully adding a channel.

[ Impact: make the 'max_channels' module parameter actually have an effect ]

Cc: <stable@kernel.org>
Reported-by: NDan Carpenter <error27@gmail.com>
Signed-off-by: NDan Williams <dan.j.williams@intel.com>

drivers/dma/dmatest.c

@@ -531,9 +531,7 @@ static int __init dmatest_init(void)
 		chan = dma_request_channel(mask, filter, NULL);
 		if (chan) {
 			err = dmatest_add_channel(chan);
-			if (err == 0)
-				continue;
-			else {
+			if (err) {
 				dma_release_channel(chan);
 				break; /* add_channel failed, punt */
 			}