perf arm-spe: Fix a typo in comment

Fix a typo: s/iff/if.
Signed-off-by: NLeo Yan <leo.yan@linaro.org>
Reviewed-by: NAndre Przywara <andre.przywara@arm.com>
Link: https://lore.kernel.org/r/20201111071149.815-3-leo.yan@linaro.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c

@@ -142,7 +142,7 @@ static int arm_spe_get_events(const unsigned char *buf, size_t len,
 
 	/* we use index to identify Events with a less number of
 	 * comparisons in arm_spe_pkt_desc(): E.g., the LLC-ACCESS,
-	 * LLC-REFILL, and REMOTE-ACCESS events are identified iff
+	 * LLC-REFILL, and REMOTE-ACCESS events are identified if
 	 * index > 1.
 	 */
 	packet->index = ret - 1;