[PATCH 05/10] of: Fix available buffer size calculating error in API of_device_uevent_modalias()

[Zijun Hu <zijun_hu@icloud.com>]

From: Zijun Hu <quic_zijuhu@quicinc.com>

of_device_uevent_modalias() saves MODALIAS value from offset
(@env->buflen - 1), so the available buffer size should be
(sizeof(@env->buf) - @env->buflen + 1), but it uses the wrong
size (sizeof(@env->buf) - @env->buflen).

Fix by using right size (sizeof(@env->buf) - @env->buflen + 1).

Fixes: dd27dcda37f0 ("of/device: merge of_device_uevent")
Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
---
 drivers/of/device.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/of/device.c b/drivers/of/device.c
index edf3be1972658f6dc165f577da53b10c7eebc116..ee29c07c83b9e6abd9b1c7747dd341026bc79eb0 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -266,10 +266,10 @@ int of_device_uevent_modalias(const struct device *dev, struct kobj_uevent_env *
 		return -ENOMEM;
 
 	sl = of_modalias(dev->of_node, &env->buf[env->buflen-1],
-			 sizeof(env->buf) - env->buflen);
+			 sizeof(env->buf) - env->buflen + 1);
 	if (sl < 0)
 		return sl;
-	if (sl >= (sizeof(env->buf) - env->buflen))
+	if (sl >= (sizeof(env->buf) - env->buflen + 1))
 		return -ENOMEM;
 	env->buflen += sl;
 

-- 
2.34.1