perf_counter: Remove unused ABI bits

extra_config_len isn't used for anything, remove it.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
LKML-Reference: <20090525124600.116035832@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

include/linux/perf_counter.h

@@ -154,11 +154,11 @@ struct perf_counter_hw_event {
 
 				__reserved_1   : 51;
 
-	__u32			extra_config_len;
 	__u32			wakeup_events;	/* wakeup every n events */
+	__u32			__reserved_2;
 
-	__u64			__reserved_2;
 	__u64			__reserved_3;
+	__u64			__reserved_4;
 };
 
 /*