libext2fs: fix ext2fs_get_device_size2() return value on Windows

libext2fs: fix ext2fs_get_device_size2() return value on Windows

Creating a file system on Windows without a pre-existing file stopped
working because the Windows version of ext2fs_get_device_size2() doesn't
return ENOENT if the file doesn't exist.  Fix this.

Fixes: 53464654bd33 ("mke2fs: fix creating a file system image w/o a pre-existing file")
Signed-off-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20230301034518.373859-1-ebiggers@kernel.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>