Don't clobber sysctl_root()'s error number.

When sysctl() is being called with a buffer that is too small, it will
return ENOMEM. Unfortunately the changes I made the other day sets the
error number to 0, because it just returns the error number of the
copyout(). Revert this part of the change.

1 files changed, 5 insertions, 2 deletions

diff --git a/sys/kern/kern_sysctl.c b/sys/kern/kern_sysctl.c
index 35dc3dc..e56c481 100644
--- a/sys/kern/kern_sysctl.c
+++ b/sys/kern/kern_sysctl.c
@@ -1371,8 +1371,11 @@ __sysctl(struct thread *td, struct sysctl_args *uap)
 		uap->new, uap->newlen, &j, 0);
 	if (error && error != ENOMEM)
 		return (error);
-	if (uap->oldlenp)
-		error = copyout(&j, uap->oldlenp, sizeof(j));
+	if (uap->oldlenp) {
+		int i = copyout(&j, uap->oldlenp, sizeof(j));
+		if (i)
+			return (i);
+	}
 	return (error);
 }