CVE-2022-49706 zonefs: fix zonefs_iomap_begin() for reads

In the Linux kernel, the following vulnerability has been resolved: zonefs: fix zonefsiomapbegin for reads If a readahead is issued to a sequential zone file with an offset exactly equal to the current file size, the iomap type is set to IOMAPUNWRITTEN, which will prevent an IO, but the iomap...