bookmaker: Remove fflush() on closed file

fflush() requires an open file handle, so it shouldn't be called
right after fclose().  And fclose() performs an fflush(), by
definition (see http://man7.org/linux/man-pages/man3/fclose.3.html ),
so we can remove this fflush() call altogether.

Change-Id: I8fbdd5a85b3cdb5edfdabbd5dca449ea1d4fce2d
Reviewed-on: https://skia-review.googlesource.com/c/191321
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
3 files changed