staging: android/ion: Don't use return in void function

Return statements are superfluous in void functions, and checkpatch
complains about them too.

Remove offending return.
Signed-off-by: Bogdan Purcareata <bogdan.purcareata@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/android/ion/ion_of.c

@@ -161,7 +161,6 @@ static int rmem_ion_device_init(struct reserved_mem *rmem, struct device *dev)
 static void rmem_ion_device_release(struct reserved_mem *rmem,
 				    struct device *dev)
 {
-	return;
 }
 
 static const struct reserved_mem_ops rmem_dma_ops = {