Decrease the file size used in getattr.t by a factor of 1024.

Decrease the file size used in getattr.t by a factor of 1024.

This issue has caused the getattr test to take... well, hours on my
MacBook. This is because the kernel is busy allocating disk pages for
all the empty space prior to the space character that's put into the
file, because the HFS+ filesystem doesn't support sparse files.