Fix EXT4_FEATURE_RO_COMPAT_HUGE_FILE check

Fix EXT4_FEATURE_RO_COMPAT_HUGE_FILE check

Creating a 4TB file on a filesystem with the 64bit flag set results in
e2fsck consistently complaining about i_blocks being wrong, with
confusing messages like this:

Inode 29818882, i_blocks is 8388608816, should be 8388608816.  Fix? no

That appears to be caused by ext2fs_inode_i_blocks() checking for the
EXT4_FEATURE_RO_COMPAT_HUGE_FILE in the wrong place.  Fix it.

Signed-off-by: Justin Maggard <jmaggard10@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>