ext4: fix mb_cache_entry's e_refcnt leak in ext4_xattr_block_cache_find()

Pavel Reichlrequested to merge
preichl1/centos-stream-9:RHEL_45031 into main

JIRA: https://issues.redhat.com/browse/RHEL-45031

CVE: CVE-2024-39276

Signed-off-by: Pavel Reichl preichl@redhat.com

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