Quota allocation is not removed when ext4_mb_new_blocks calls
kmem_cache_alloc failed.  Also make sure the allocation context is freed
on the error path.
Signed-off-by: NShen Feng <shen@cn.fujitsu.com>
Signed-off-by: NMingming Cao <cmm@us.ibm.com>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>