macvtap: fix 2 nla_put expressions (non-serious bug)

This patch fixes 2 occurrences of nla_put expression with a '!' in
front of them that basically prevented the detection that the buffer
is too small. However, code further below would then detect that the
buffer is too small when further parts are added to the netlink message.

src/util/macvtap.c

@@ -1048,8 +1048,8 @@ doPortProfileOpSetLink(bool nltarget_kernel,
 
             memcpy(ifla_vf_mac.mac, macaddr, 6);
 
-            if (!nla_put(nl_msg, IFLA_VF_MAC, sizeof(ifla_vf_mac),
-                &ifla_vf_mac) < 0)
+            if (nla_put(nl_msg, IFLA_VF_MAC, sizeof(ifla_vf_mac),
+                        &ifla_vf_mac) < 0)
                 goto buffer_too_small;
         }
 
@@ -1060,8 +1060,8 @@ doPortProfileOpSetLink(bool nltarget_kernel,
                 .qos = 0,
             };
 
-            if (!nla_put(nl_msg, IFLA_VF_VLAN, sizeof(ifla_vf_vlan),
-                &ifla_vf_vlan) < 0)
+            if (nla_put(nl_msg, IFLA_VF_VLAN, sizeof(ifla_vf_vlan),
+                        &ifla_vf_vlan) < 0)
                 goto buffer_too_small;
         }