f2fs: sanity check segment count

F2FS uses 4 bytes to represent block address. As a result, supported
size of disk is 16 TB and it equals to 16 * 1024 * 1024 / 2 segments.

Change-Id: I64d9be6dcc4ab5d8a45359c69d6163ed0209e8fe
Signed-off-by: Jin Qian <jinqian@google.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Git-repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git


Git-commit: b9dd46188edc2f0d1f37328637860bb65a771124
Signed-off-by: Dennis Cagle <dcagle@codeaurora.org>