jfs: Fix uninit-value access of new_ea in ea_buffer

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UBUNTU-CVE-2024-49900

In the Linux kernel, the following vulnerability has been resolved: jfs: Fix uninit-value access of newea in eabuffer syzbot reports that lzo1x1docompress is using uninit-value: ===================================================== BUG: KMSAN: uninit-value in lzo1x1docompress+0x19f9/0x2510...