f2fs: xattr simplifications
f2fs: xattr simplifications

Now that the xattr handler is passed to the xattr handler operations, we
have access to the attribute name prefix, so simplify
f2fs_xattr_generic_list.

Also, f2fs_xattr_advise_list is only ever called for
f2fs_xattr_advise_handler; there is no need to double check for that.

Signed-off-by: Andreas Gruenbacher <aa72c01072d4bf2072d18f225c78c2a045835d6e@redhat.com>
Cc: Jaegeuk Kim <71255387a32c360dfbe6dfb7aaeb123bf1dc8cb6@kernel.org>
Cc: Changman Lee <f10da886ecf5f6d400f766170992d382feccd416@samsung.com>
Cc: Chao Yu <0cc5db7488e13b393f245aa6263acec5e92fdcc5@samsung.com>
Cc: b8a3a6e64ebdf3f6bfe40f20369f53b2a58bd541@lists.sourceforge.net
Signed-off-by: Al Viro <de609eb4d5d70b1d38ec6642adbfc33a2781f63c@zeniv.linux.org.uk>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs