staging: wfx: drop useless check

Currently, the ISR check if bus->core is not NULL. But, it is a useless
check. bus->core is initialiased before to request IRQ and it is not
assigned to NULL when it is released.
Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200505123757.39506-5-Jerome.Pouiller@silabs.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/bus_sdio.c

@@ -91,20 +91,13 @@ static void wfx_sdio_irq_handler(struct sdio_func *func)
 {
 	struct wfx_sdio_priv *bus = sdio_get_drvdata(func);
 
-	if (bus->core)
-		wfx_bh_request_rx(bus->core);
-	else
-		WARN(!bus->core, "race condition in driver init/deinit");
+	wfx_bh_request_rx(bus->core);
 }
 
 static irqreturn_t wfx_sdio_irq_handler_ext(int irq, void *priv)
 {
 	struct wfx_sdio_priv *bus = priv;
 
-	if (!bus->core) {
-		WARN(!bus->core, "race condition in driver init/deinit");
-		return IRQ_NONE;
-	}
 	sdio_claim_host(bus->func);
 	wfx_bh_request_rx(bus->core);
 	sdio_release_host(bus->func);

drivers/staging/wfx/bus_spi.c

@@ -140,10 +140,6 @@ static irqreturn_t wfx_spi_irq_handler(int irq, void *priv)
 {
 	struct wfx_spi_priv *bus = priv;
 
-	if (!bus->core) {
-		WARN(!bus->core, "race condition in driver init/deinit");
-		return IRQ_NONE;
-	}
 	queue_work(system_highpri_wq, &bus->request_rx);
 	return IRQ_HANDLED;
 }