CVE-2024-38604 block: refine the EOF check in blkdev_iomap_begin

In the Linux kernel, the following vulnerability has been resolved: block: refine the EOF check in blkdeviomapbegin blkdeviomapbegin rounds down the offset to the logical block size before stashing it in iomap-offset and checking that it still is inside the inode size. Check the isize check to th...