Pull up following revision(s) (requested by bouyer in ticket #974):
	sys/arch/xen/xen/xbdback_xenbus.c: revision 1.58
Add more XENPRINTF() to xbdback_connect()
in xbdback_backend_changed(), fix memory leak.
Do not free an uninitialized pointer in xbdback_connect(). Should fix
 hypervisor or dom0 reboot when using windows PV drivers, as reported
 by several users on port-xen.
Pull up following revision(s) (requested by joerg in ticket #976):
	libexec/ld.elf_so/tls.c: revision 1.9
	tests/lib/libc/tls/dso/h_tls_dlopen.c: revision 1.5
Only initialise TLS space from the PT_TLS segment, if the size is
positive and the offset has been computed. Fixes PR lib/48324.
Tickets 974 and 976.