drm: panel-orientation-quirks: Convert to use match_string() helper

The new helper returns index of the matching string in an array.
We are going to use it here.
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180503184119.22355-1-andriy.shevchenko@linux.intel.com

drivers/gpu/drm/drm_panel_orientation_quirks.c

@@ -172,10 +172,9 @@ int drm_get_panel_orientation_quirk(int width, int height)
 		if (!bios_date)
 			continue;
 
-		for (i = 0; data->bios_dates[i]; i++) {
-			if (!strcmp(data->bios_dates[i], bios_date))
-				return data->orientation;
-		}
+		i = match_string(data->bios_dates, -1, bios_date);
+		if (i >= 0)
+			return data->orientation;
 	}
 
 	return DRM_MODE_PANEL_ORIENTATION_UNKNOWN;