xfrm: fix one more kernel-infoleak in algo dumping

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UBUNTU-CVE-2024-50110

In the Linux kernel, the following vulnerability has been resolved: xfrm: fix one more kernel-infoleak in algo dumping During fuzz testing, the following issue was discovered: BUG: KMSAN: kernel-infoleak in copytoiter+0x598/0x2a30 copytoiter+0x598/0x2a30 skbdatagramiter+0x168/0x1060...