perf, sparc: Fix CONFIG_PERF_EVENTS=y build error

Fix a typo in:

  004417a6: perf, arch: Cleanup perf-pmu init vs lockup-detector

Which caused a build failure on Sparc, reported by Stephen Rothwell.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/sparc/kernel/perf_event.c

@@ -1323,7 +1323,7 @@ int __init init_hw_perf_events(void)
 
 	return 0;
 }
-early_initcall(init_hw_perf_event);
+early_initcall(init_hw_perf_events);
 
 void perf_callchain_kernel(struct perf_callchain_entry *entry,
 			   struct pt_regs *regs)