MFC r311160, r311210, r311288, r311292, r311298, r311340

r311160:
misc minor fixes in mpr(4)

sys/dev/mpr/mpr_sas.c
* Fix a potential null pointer dereference (CID 1305731)
* Check for overrun of the ccb_scsiio.cdb_io.cdb_bytes buffer (CID
1211934)

sys/dev/mpr/mpr_sas_lsi.c
* Nullify a dangling pointer in mprsas_get_sata_identify
* Fix a memory leak in mprsas_SSU_to_SATA_devices (CID 1211935)

Reported by: Coverity (partially)
CID: 1305731 1211934 1211935
Reviewed by: slm
MFC after: 4 weeks
Sponsored by: Spectra Logic Corp
Differential Revision: https://reviews.freebsd.org/D8880

r311210:
Quell Coverity for diskinfo(8)

* CID 1198994: Don't run the speed disk on a disk with no sectors
* CID 1011442: Don't call close(2) if open(2) fails
* CID 1011161: Use snprintf instead of sprintf
* CID 1009825: Check the return value of lseek

Reported by: Coverity
CID: 1198994 1011442 1011161 1009825
MFC after: 4 weeks
Sponsored by: Spectra Logic Corp

r311288:
Delete dead code in chat(8)

It's always been dead, ever since first import in 1994. It's still dead in
OpenBSD's version, too.

Reported by: Coverity
CID: 270586
MFC after: 4 weeks
Sponsored by: Spectra Logic Corp

r311292:
Remove dead code in rpc_parse.c

It's been dead ever since it was imported from TI-RPC in 1995. The dead
code is still present in Illumos today, but was removed from NetBSD in 2006.

Reported by: Coverity
CID: 270097
Obtained from: NetBSD
MFC after: 4 weeks
Sponsored by: Spectra Logic Corp

r311298:
Remove dead code in dhclient(8)

The offending code has been dead ever since the import from OpenBSD in
r195805. OpenBSD later deleted that entire function.

Reported by: Coverity
CID: 500059
MFC after: 4 weeks
Sponsored by: Spectra Logic Corp

r311340:
Misc Coverity fixes for tail(1)

CID 1006402: Initialize stack variable
CID 271580: Don't leak memory when ENOMEM.

Reported by: Coverity
CID: 271580 1006402
MFC after: 4 weeks
Sponsored by: Spectra Logic Corp

MFC r309027:

Allocate a struct ifreq rather than using a (wrong) computed size for
the BIOCSETIF ioctl.

The kernel always copies an entire struct ifreq and IPv4 addresses will
always fit in an ifreq.

On systems with pointers larger than 64-bits, the computed size will be
less than the size of struct ifreq, potentially resulting in the kernel
attempting to copyin memory from outside the allocation.

Reviewed by: jhb
Obtained from: CheriBSD
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D8445

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Fix the logic to count the number of "live interfaces". With this change
dhclient now terminates when the underlying ifnet is destroyed (e.g.
on card eject).

Reviewed by: brooks
Approved by: re (kib)

Teach dhclient(8) about net80211 link (association) status.

Reviewed by: brooks
MFC after: 3 days

Add __FBSDID to all .c files in dhclient to aid in determining file
versions when dealing with user problems.

This commit was generated by cvs2svn to compensate for changes in r147072,
which included commits to RCS files with non-trunk default branches.

Import the OpenBSD dhclient as shipped with OpenBSD-3.7 (the tag
OPENBSD_3_7).