perf: Remove the nmi parameter from the oprofile_perf backend

In commit a8b0ca17 ("perf: Remove the nmi parameter from the
swevent and overflow interface") one site was overlooked.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20110708173442.GB31972@e102144-lin.cambridge.arm.comSigned-off-by: Ingo Molnar <mingo@elte.hu>

drivers/oprofile/oprofile_perf.c

@@ -31,7 +31,7 @@ static int num_counters;
 /*
  * Overflow callback for oprofile.
  */
-static void op_overflow_handler(struct perf_event *event, int unused,
+static void op_overflow_handler(struct perf_event *event,
 			struct perf_sample_data *data, struct pt_regs *regs)
 {
 	int id;