CVE-2022-48740

In the Linux kernel, the following vulnerability has been resolved:
selinux: fix double free of cond_list on error paths On error path from
cond_read_list() and duplicate_policydb_cond_list() the cond_list_destroy()
gets called a second time in caller functions, resulting in NULL pointer
deref. Fix this by resetting the cond_list_len to 0 in cond_list_destroy(),
making subsequent calls a noop. Also consistently reset the cond_list
pointer to NULL after freeing. [PM: fix line lengths in the description]