staging: net: netlogic: Remove unneeded cast

Fix Coccinelle alert:

drivers/staging//netlogic/xlr_net.c:996:12-30: WARNING: casting value returned by memory allocation function to (struct xlr_adapter *) is useless.

This issue was detected by using the Coccinelle software.
Signed-off-by: Christopher Diaz Riveros <chrisadr@gentoo.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/netlogic/xlr_net.c

@@ -993,8 +993,7 @@ static int xlr_net_probe(struct platform_device *pdev)
 	/*
 	 * Allocate our adapter data structure and attach it to the device.
 	 */
-	adapter = (struct xlr_adapter *)
-		devm_kzalloc(&pdev->dev, sizeof(*adapter), GFP_KERNEL);
+	adapter = devm_kzalloc(&pdev->dev, sizeof(*adapter), GFP_KERNEL);
 	if (!adapter)
 		return -ENOMEM;