lib/generic-radix-tree.c: Don't overflow in peek()
JIRA: https://issues.redhat.com/browse/RHEL-37739
JIRA: https://issues.redhat.com/browse/RHEL-37740
CVE: CVE-2021-47432
MR: !4292 (merged)
Signed-off-by: Waiman Long longman@redhat.com
Edited by Waiman Long