jffs2: check jffs2_prealloc_raw_node_refs() result in few other places

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PT-2025-27969

Name of the Vulnerable Software and Affected Versions: Linux kernel versions prior to 6.1.128 Description: A bug in the jffs2 file system has been detected, caused by a fault injection in jffs2 prealloc raw node refs. The function jffs2 sum write sumnode does not check the return value of jffs2...