[PATCH] USB: net2280 warning fix

For some reason alpha doesn't include <linux/dma-mapping.h> where other
architectures do; this makes net2280 include it explicitly.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/gadget/net2280.c

@@ -47,6 +47,7 @@
 #include <linux/config.h>
 #include <linux/module.h>
 #include <linux/pci.h>
+#include <linux/dma-mapping.h>
 #include <linux/kernel.h>
 #include <linux/delay.h>
 #include <linux/ioport.h>