[PATCH] netdev: silence valgrind warning about ioctl use

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Valgrind complained:

==3770== Syscall param ioctl(SIOCETHTOOL) points to uninitialised byte(s)
==3770==    at 0x919D407: ioctl (syscall-template.S:81)
==3770==    by 0x530FE7E: rpl_ioctl (ioctl.c:42)
==3770==    by 0x50CB433: virNetDevFeatureAvailable (virnetdev.c:2764)
==3770==    by 0x50CB6A7: virNetDevGetFeatures (virnetdev.c:2830)
==3770==    by 0x1F0E5347: udevProcessNetworkInterface (node_device_udev.c:722)
==3770==    by 0x1F0E689F: udevGetDeviceDetails (node_device_udev.c:1300)
==3770==    by 0x1F0E6E06: udevAddOneDevice (node_device_udev.c:1422)
==3770==    by 0x1F0E6FB8: udevProcessDeviceListEntry (node_device_udev.c:1464)
==3770==    by 0x1F0E70CF: udevEnumerateDevices (node_device_udev.c:1494)
==3770==    by 0x1F0E7BB4: nodeStateInitialize (node_device_udev.c:1806)
==3770==    by 0x51B4303: virStateInitialize (libvirt.c:777)
==3770==    by 0x11DEE7: daemonRunStateInit (libvirtd.c:906)
==3770==  Address 0x228e38d4 is on thread 12's stack
==3770==  in frame #2, created by virNetDevFeatureAvailable (virnetdev.c:2750)

* src/util/virnetdev.c (virNetDevFeatureAvailable): Initialize all
bytes of ifr.

Signed-off-by: Eric Blake <eblake@xxxxxxxxxx>
---
 src/util/virnetdev.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/util/virnetdev.c b/src/util/virnetdev.c
index 093c99c..54d866e 100644
--- a/src/util/virnetdev.c
+++ b/src/util/virnetdev.c
@@ -2758,6 +2758,7 @@ virNetDevFeatureAvailable(const char *ifname, struct ethtool_value *cmd)
         goto cleanup;
     }

+    memset(&ifr, 0, sizeof(ifr));
     strcpy(ifr.ifr_name, ifname);
     ifr.ifr_data = (void*) cmd;

-- 
2.1.0

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