staging: dgnc: Remove unnecessary 'return' statement

This commit fixes the checkpath warning 'void function return
statements are not generally useful' caused by the 'return' at the end
of 'void' function.

Signed-off-by: Konrad Zapalowicz <bergo.torino@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/dgnc/dgnc_cls.c b/drivers/staging/dgnc/dgnc_cls.c
index 0d3ca7c..fe099c6 100644
--- a/drivers/staging/dgnc/dgnc_cls.c
+++ b/drivers/staging/dgnc/dgnc_cls.c
@@ -1138,8 +1138,6 @@
 		ch->ch_flags &= ~(CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
 
 	DGNC_UNLOCK(ch->ch_lock, lock_flags);
-
-	return;
 }