ext4: drop the EXT4_STATE_DELALLOC_RESERVED flag

Having done a full regression test, we can now drop the
DELALLOC_RESERVED state flag.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>

diff --cc fs/ext4/ext4.h
Simple merge

diff --cc fs/ext4/inode.c
Simple merge

diff --cc fs/ext4/mballoc.c
Simple merge