FreeBSD_HEAD_amd64_gcc - Build #1241 - Fixed

FreeBSD_HEAD_amd64_gcc - Build #1241 - Fixed:

Build information: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_amd64_gcc/1241/
Full change log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_amd64_gcc/1241/changes
Full build log: https://jenkins.FreeBSD.org/job/FreeBSD_HEAD_amd64_gcc/1241/console

Change summaries:

299587 by jasone:
Update jemalloc to 4.2.0.

299586 by pfg:
i2c(8): uninitialized variable (UNINIT).

If i2c_opt.width is somehow zero, the bufsize will be left uninitialized
and make cause trouble later on.

CID:		1331549

299585 by truckman:
Declare line[] in the outermost scope of retrieve() instead of
declaring it in an inner scope and then using it via a pointer
in the outer scope.

Reported by:    Coverity
CID:            605895

299584 by truckman:
Mark usage() as __dead2 so that Coverity doesn't think that execution
continues after the call and uses a negative array subscript.

Reported by:	Coverity
CID:		1305629