[PATCH] asus-wmi: Fix "unsigned 'retval' is never less than zero" smatch warning

[Jiapeng Chong]

Eliminate the follow smatch warnings:

drivers/platform/x86/asus-wmi.c:478 panel_od_write() warn: unsigned
'retval' is never less than zero.

drivers/platform/x86/asus-wmi.c:566 panel_od_write() warn: unsigned
'retval' is never less than zero.

drivers/platform/x86/asus-wmi.c:1451 panel_od_write() warn: unsigned
'retval' is never less than zero.

Reported-by: Abaci Robot <abaci@xxxxxxxxxxxxxxxxx>
Fixes: 98829e84dc67 ("asus-wmi: Add dgpu disable method")
Fixes: 382b91db8044 ("asus-wmi: Add egpu enable method")
Fixes: ca91ea34778f ("asus-wmi: Add panel overdrive functionality")
Signed-off-by: Jiapeng Chong <jiapeng.chong@xxxxxxxxxxxxxxxxx>
---
 drivers/platform/x86/asus-wmi.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index cc58118..22af431 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -475,7 +475,7 @@ static int dgpu_disable_write(struct asus_wmi *asus)
 		return err;
 	}
 
-	if (retval > 1 || retval < 0) {
+	if (retval > 1) {
 		pr_warn("Failed to set dgpu disable (retval): 0x%x\n", retval);
 		return -EIO;
 	}
@@ -563,7 +563,7 @@ static int egpu_enable_write(struct asus_wmi *asus)
 		return err;
 	}
 
-	if (retval > 1 || retval < 0) {
+	if (retval > 1) {
 		pr_warn("Failed to set egpu disable (retval): 0x%x\n", retval);
 		return -EIO;
 	}
@@ -1448,7 +1448,7 @@ static int panel_od_write(struct asus_wmi *asus)
 		return err;
 	}
 
-	if (retval > 1 || retval < 0) {
+	if (retval > 1) {
 		pr_warn("Failed to set panel overdrive (retval): 0x%x\n", retval);
 		return -EIO;
 	}
-- 
1.8.3.1