CVE-2025-38458 atm: clip: Fix NULL pointer dereference in vcc_sendmsg()

In the Linux kernel, the following vulnerability has been resolved: atm: clip: Fix NULL pointer dereference in vccsendmsg atmarpddevops does not implement the send method, which may cause crash as bellow. BUG: kernel NULL pointer dereference, address: 0000000000000000 PGD 0 P4D 0 Oops: Oops: 0010...