virarptable: Avoid cast align warnings

We have to use VIR_WARNINGS_NO_CAST_ALIGN to avoid clang warning
about increased required alignment caused by some netlink macros.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

src/util/virarptable.c

@@ -51,10 +51,11 @@ static int
 parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len)
 {
     memset(tb, 0, sizeof(struct rtattr *) * (max + 1));
-    while (RTA_OK(rta, len)) {
+    VIR_WARNINGS_NO_CAST_ALIGN
+    for (; RTA_OK(rta, len); rta = RTA_NEXT(rta, len)) {
+        VIR_WARNINGS_RESET
         if ((rta->rta_type <= max) && (!tb[rta->rta_type]))
             tb[rta->rta_type] = rta;
-        rta = RTA_NEXT(rta, len);
     }
 
     if (len)
@@ -82,7 +83,9 @@ virArpTablePtr virArpTableGet(void)
 
     nh = (struct nlmsghdr*)nlData;
 
-    while (NLMSG_OK(nh, msglen)) {
+    VIR_WARNINGS_NO_CAST_ALIGN
+    for (; NLMSG_OK(nh, msglen); nh = NLMSG_NEXT(nh, msglen)) {
+        VIR_WARNINGS_RESET
         struct ndmsg *r = NLMSG_DATA(nh);
         int len = nh->nlmsg_len;
         void *addr;
@@ -94,23 +97,23 @@ virArpTablePtr virArpTableGet(void)
         }
 
         if (r->ndm_family && (r->ndm_family != AF_INET))
-          goto next_nlmsg;
+            continue;
 
         /* catch stale and reachalbe arp entry only */
         if (r->ndm_state &&
-          (!(r->ndm_state == NUD_STALE || r->ndm_state == NUD_REACHABLE))) {
-          nh = NLMSG_NEXT(nh, msglen);
+            (!(r->ndm_state == NUD_STALE || r->ndm_state == NUD_REACHABLE)))
             continue;
-      }
 
         if (nh->nlmsg_type == NLMSG_DONE)
             goto end_of_netlink_messages;
 
+        VIR_WARNINGS_NO_CAST_ALIGN
         parse_rtattr(tb, NDA_MAX, NDA_RTA(r),
                      nh->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
+        VIR_WARNINGS_RESET
 
         if (tb[NDA_DST] == NULL || tb[NDA_LLADDR] == NULL)
-          goto next_nlmsg;
+            continue;
 
         if (tb[NDA_DST]) {
             virSocketAddr virAddr;
@@ -146,9 +149,6 @@ virArpTablePtr virArpTableGet(void)
 
             num++;
         }
-
- next_nlmsg:
-      nh = NLMSG_NEXT(nh, msglen);
     }
 
  end_of_netlink_messages: