perf events, x86, P4: Fix typo in comment

Signed-off-by: Justin P. Mattock <justinmattock@gmail.com>
Acked-by: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: trivial@kernel.org
Link: http://lkml.kernel.org/r/1303492132-3004-1-git-send-email-justinmattock@gmail.comSigned-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/cpu/perf_event_p4.c

@@ -1187,7 +1187,7 @@ static __init int p4_pmu_init(void)
 {
 	unsigned int low, high;
 
-	/* If we get stripped -- indexig fails */
+	/* If we get stripped -- indexing fails */
 	BUILD_BUG_ON(ARCH_P4_MAX_CCCR > X86_PMC_MAX_GENERIC);
 
 	rdmsr(MSR_IA32_MISC_ENABLE, low, high);