[PATCH] drm/msm/dp: fix error check return value of irq_of_parse_and_map()

[cgel.zte at gmail.com]

From: Lv Ruyi <lv.ruyi at zte.com.cn>

The irq_of_parse_and_map() function returns 0 on failure, and does not
return an negative value.

Fixes: 	8ede2ecc3e5e ("drm/msm/dp: Add DP compliance tests on Snapdragon Chipsets")
Reported-by: Zeal Robot <zealci at zte.com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi at zte.com.cn>
---
 drivers/gpu/drm/msm/dp/dp_display.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index a42732b67349..3926d2ac107d 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -1239,7 +1239,7 @@ int dp_display_request_irq(struct msm_dp *dp_display)
 	dp = container_of(dp_display, struct dp_display_private, dp_display);
 
 	dp->irq = irq_of_parse_and_map(dp->pdev->dev.of_node, 0);
-	if (dp->irq < 0) {
+	if (!dp->irq) {
 		rc = dp->irq;
 		DRM_ERROR("failed to get irq: %d\n", rc);
 		return rc;
-- 
2.25.1