dmaengine.h: remove redundant else keyword

dmaengine_device_control returns -ENOSYS in case the dma driver doesn't have
such functionality.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index bfcdecb..f593999 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -610,8 +610,8 @@
 {
 	if (chan->device->device_control)
 		return chan->device->device_control(chan, cmd, arg);
-	else
-		return -ENOSYS;
+
+	return -ENOSYS;
 }
 
 static inline int dmaengine_slave_config(struct dma_chan *chan,