4936 lz4 could theoretically overflow a pointer with a certain input
Reviewed by: Saso Kiselkov <skiselkov.ml@gmail.com>
Reviewed by: Keith Wesolowski <keith.wesolowski@joyent.com>
Approved by: Gordon Ross <gordon.ross@nexenta.com>
	[illumos-gate merge]

commit 58d0718061c87e3d647c891ec5281b93c08dba4e
    4936 lz4 could theoretically overflow a pointer with a certain input