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Fix Linux 2.6.30 compatibility

Linux 2.6.30 doesn't define IRQ_NONE as a macro. Assume irqreturn_t,
IRQ_NONE and IRQ_HANDLED to be present on Linux 2.6.29 and newer.
http://madwifi-project.org/changeset/3986
--- a/ath/if_athvar.h
+++ b/ath/if_athvar.h
@@ -83,11 +83,13 @@ typedef void *TQUEUE_ARG;
 /*
  * Guess how the interrupt handler should work.
  */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,29)
 #if !defined(IRQ_NONE)
 typedef void irqreturn_t;
 #define	IRQ_NONE
 #define	IRQ_HANDLED
 #endif /* !defined(IRQ_NONE) */
+#endif /* Linux < 2.6.29 */
 
 #ifndef SET_MODULE_OWNER
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)