Staging: sbe-2t3e3: redundant null check before kfree()

Signed-off-by: Alexander Beregalov <a.beregalov@gmail.com>
Cc: Krzysztof Halasa <khc@pm.waw.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/sbe-2t3e3/dc.c

@@ -442,15 +442,10 @@ void dc_drop_descriptor_list(struct channel *sc)
 		}
 	}
 
-	if (sc->ether.rx_ring != NULL) {
 	kfree(sc->ether.rx_ring);
 	sc->ether.rx_ring = NULL;
-	}
-
-	if (sc->ether.tx_ring != NULL) {
 	kfree(sc->ether.tx_ring);
 	sc->ether.tx_ring = NULL;
-	}
 }