staging: rtl8192u: r8192U_core: remove return statement of void function

void function return statement was not useful in this case.

Signed-off-by: Raphaël Beamonte <raphael.beamonte@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/rtl8192u/r8192U_core.c b/drivers/staging/rtl8192u/r8192U_core.c
index 2ab0a98..90c5907 100644
--- a/drivers/staging/rtl8192u/r8192U_core.c
+++ b/drivers/staging/rtl8192u/r8192U_core.c
@@ -1481,7 +1481,6 @@
 
 static void tx_zero_isr(struct urb *tx_urb)
 {
-	return;
 }
 
 /*