staging: most: fix tracking of MBO offset

This patch increments mbo_offs by the number of bytes that have
been copied and resets it in case a complete mbo has been transferred
to user buffer.
Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/most/aim-cdev/cdev.c

@@ -257,9 +257,8 @@ aim_read(struct file *filp, char __user *buf, size_t count, loff_t *offset)
 
 	copied = to_copy - not_copied;
 
-	if (count < mbo->processed_length) {
-		channel->mbo_offs = copied;
-	} else {
+	channel->mbo_offs += copied;
+	if (channel->mbo_offs >= mbo->processed_length) {
 		most_put_mbo(mbo);
 		channel->mbo_offs = 0;
 		channel->stacked_mbo = NULL;