Replace C division operators with div64_u64 for divides introduced in:
commit 503f4bdc


ext4: use atomic64_t for the per-flexbg free_clusters count

Specific to the 3.0-stable backport of the upstream patch.
Signed-off-by: Todd Poynor <toddpoynor@google.com>
Reviewed-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Christoph Biedl <linux-kernel.bfrz@manchmal.in-ulm.de>
Cc: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>