greybus: loopback: fix typo in comment

Alex previously post a patch to fix this typo. Somehow it fell through the
cracks in the meantime. Do it again 'stastic' is a word 'statistic' is not.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/loopback.c

@@ -675,7 +675,7 @@ static void gb_loopback_calculate_stats(struct gb_loopback *gb)
 	/* Express latency in terms of microseconds */
 	lat = gb_loopback_nsec_to_usec_latency(gb->elapsed_nsecs);
 
-	/* Log latency statistic */
+	/* Log latency stastic */
 	gb_loopback_update_stats(&gb_dev.latency, lat);
 	gb_loopback_update_stats(&gb->latency, lat);