AOSP: Fix file offset overflow issue when file's size > 4G

AOSP: Fix file offset overflow issue when file's size > 4G

fs->blocksize is int(4 bytes), while data is off_t(8 bytes),
'data_blk = data & ~(fs->blocksize - 1)' will cause data_blk
lose high 4 bytes of data if data > 4G and it'll cause file
inconsistent when using -d option to populate ext4 image file.

[ This was also fixed upstream via 1eec7413677e: "create_inode: fix
  copying large files".  This commit is just to clean up
  whitespace/formatting issues. -- tytso ]

Signed-off-by: Chen Lin Z <lin.z.chen@intel.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
From AOSP commit: 999dd56f2586fadec7bfe846b8cb52c5e528248f