match_string() returns the array index of a matching string.
Use it instead of the open-coded implementation.

Signed-off-by: YueHaibing <yuehaib...@huawei.com>
---
 drivers/gpu/drm/i2c/ch7006_drv.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i2c/ch7006_drv.c b/drivers/gpu/drm/i2c/ch7006_drv.c
index b91e48d..f9a46b5 100644
--- a/drivers/gpu/drm/i2c/ch7006_drv.c
+++ b/drivers/gpu/drm/i2c/ch7006_drv.c
@@ -464,16 +464,13 @@ static int ch7006_encoder_init(struct i2c_client *client,
        priv->chip_version = ch7006_read(client, CH7006_VERSION_ID);
 
        if (ch7006_tv_norm) {
-               for (i = 0; i < NUM_TV_NORMS; i++) {
-                       if (!strcmp(ch7006_tv_norm_names[i], ch7006_tv_norm)) {
-                               priv->norm = i;
-                               break;
-                       }
-               }
-
-               if (i == NUM_TV_NORMS)
+               i = match_string(ch7006_tv_norm_names, NUM_TV_NORMS,
+                                ch7006_tv_norm);
+               if (i < 0)
                        ch7006_err(client, "Invalid TV norm setting \"%s\".\n",
                                   ch7006_tv_norm);
+               else
+                       priv->norm = i;
        }
 
        if (ch7006_scale >= 0 && ch7006_scale <= 2)
-- 
2.7.4


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