CVE-2023-53323 ext2/dax: Fix ext2_setsize when len is page aligned

In the Linux kernel, the following vulnerability has been resolved: ext2/dax: Fix ext2setsize when len is page aligned PAGEALIGNx macro gives the next highest value which is multiple of pagesize. But if x is already page aligned then it simply returns x. So, if x passed is 0 in daxzerorange...