CVE-2024-26622 tomoyo: fix UAF write bug in tomoyo_write_control()

In the Linux kernel, the following vulnerability has been resolved: tomoyo: fix UAF write bug in tomoyowritecontrol Since tomoyowritecontrol updates head-writebuf when write of long lines is requested, we need to fetch head-writebuf after head-iosem is held. Otherwise, concurrent write requests c...