ext2: Handle error from dquot_initalize()

dquot_initialize() can now return error. Handle it where possible.

Signed-off-by: Jan Kara <jack@suse.com>

diff --cc fs/ext2/ialloc.c
Simple merge

diff --cc fs/ext2/inode.c
Simple merge

diff --cc fs/ext2/namei.c
Simple merge