lib/socket/interfaces: Fix some uninitialied bytes.

lib/socket/interfaces: Fix some uninitialied bytes.

Valgrind reports the following:

==26599== Syscall param ioctl(SIOCETHTOOL) points to uninitialised byte(s)
==26599==    at 0x7014707: ioctl (in /usr/lib64/libc-2.22.so)
==26599==    by 0x79D1585: query_iface_speed_from_name (interfaces.c:152)
==26599==    by 0x79D1BBA: _get_interfaces (interfaces.c:277)
==26599==    by 0x79D1E80: get_interfaces (interfaces.c:368)
==26599==    by 0x508A7E3: load_interfaces (interface.c:612)
==26599==    by 0x150B30: main (net.c:963)
==26599==  Address 0xffefff0d8 is on thread 1's stack
==26599==  in frame #1, created by query_iface_speed_from_name
(interfaces.c:130)
==26599==
==26599== Syscall param ioctl(SIOCETHTOOL) points to uninitialised byte(s)
==26599==    at 0x7014707: ioctl (in /usr/lib64/libc-2.22.so)
==26599==    by 0x79D15CC: query_iface_speed_from_name (interfaces.c:164)
==26599==    by 0x79D1BBA: _get_interfaces (interfaces.c:277)
==26599==    by 0x79D1E80: get_interfaces (interfaces.c:368)
==26599==    by 0x508A7E3: load_interfaces (interface.c:612)
==26599==    by 0x150B30: main (net.c:963)
==26599==  Address 0xffefff0d8 is on thread 1's stack
==26599==  in frame #1, created by query_iface_speed_from_name
(interfaces.c:130)

Guenther

Signed-off-by: Guenther Deschner <gd@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
(cherry picked from commit 2e2f81134c86ef3146781d62d9f561f496b74ee2)

BUG: https://bugzilla.samba.org/show_bug.cgi?id=11802
lib/socket/interfaces: fix valgrind warning

Autobuild-User(v4-4-test): Karolin Seeger <kseeger@samba.org>
Autobuild-Date(v4-4-test): Mon Mar 21 20:01:47 CET 2016 on sn-devel-144