perf, powerpc: fsl_emb: Restore setting perf_sample_data.period

Commit 6b95ed34 changed from
a struct initializer to perf_sample_data_init(), but the setting
of the .period member was left out.
Signed-off-by: NScott Wood <scottwood@freescale.com>
Cc: stable@kernel.org
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/kernel/perf_event_fsl_emb.c

@@ -569,6 +569,7 @@ static void record_and_restart(struct perf_event *event, unsigned long val,
 		struct perf_sample_data data;
 
 		perf_sample_data_init(&data, 0);
+		data.period = event->hw.last_period;
 
 		if (perf_event_overflow(event, nmi, &data, regs)) {
 			/*