The helper returns index of the matching string in an array,
use it to simpler the code.

Signed-off-by: Yisheng Xie <xieyishe...@huawei.com>
---
 drivers/hwtracing/intel_th/pti.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/hwtracing/intel_th/pti.c b/drivers/hwtracing/intel_th/pti.c
index 5669433..75cb368 100644
--- a/drivers/hwtracing/intel_th/pti.c
+++ b/drivers/hwtracing/intel_th/pti.c
@@ -272,15 +272,12 @@ static ssize_t lpp_dest_store(struct device *dev, struct 
device_attribute *attr,
                              const char *buf, size_t size)
 {
        struct pti_device *pti = dev_get_drvdata(dev);
-       ssize_t ret = -EINVAL;
-       int i;
+       ssize_t ret;
 
-       for (i = 0; i < ARRAY_SIZE(lpp_dest_str); i++)
-               if (sysfs_streq(buf, lpp_dest_str[i]))
-                       break;
+       ret = sysfs_match_string(lpp_dest_str, buf);
 
-       if (i < ARRAY_SIZE(lpp_dest_str) && pti->lpp_dest_mask & BIT(i)) {
-               pti->lpp_dest = i;
+       if (ret >= 0 && pti->lpp_dest_mask & BIT(ret)) {
+               pti->lpp_dest = ret;
                ret = size;
        }
 
-- 
1.7.12.4

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