time: fix typo in comments

Fix typo in comments.

BTW: I have to fix coding style in arch/ia64/kernel/time.c also, otherwise
checkpatch.pl will be complaining.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: john stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/x86/kernel/time_64.c

@@ -77,7 +77,7 @@ unsigned long __init native_calculate_cpu_khz(void)
 		reserve_evntsel_nmi(MSR_K7_EVNTSEL0 + i);
 	}
 	local_irq_save(flags);
-	/* start meauring cycles, incrementing from 0 */
+	/* start measuring cycles, incrementing from 0 */
 	wrmsrl(MSR_K7_PERFCTR0 + i, 0);
 	wrmsrl(MSR_K7_EVNTSEL0 + i, 1 << 22 | 3 << 16 | 0x76);
 	rdtscl(tsc_start);