VXLAN: Replace the remaining "goto invalid" check with ND_ICHECK_U()

Rename variable 'len' to 'length' for ND_ICHECK_U() printing.

Author: fxlb

print-vxlan.c

@@ -48,14 +48,13 @@ static const struct tok vxlan_flags [] = {
  */
 
 void
-vxlan_print(netdissect_options *ndo, const u_char *bp, u_int len)
+vxlan_print(netdissect_options *ndo, const u_char *bp, u_int length)
 {
     uint8_t flags;
 
     ndo->ndo_protocol = "vxlan";
     nd_print_protocol_caps(ndo);
-    if (len < VXLAN_HDR_LEN)
-        goto invalid;
+    ND_ICHECK_U(length, <, VXLAN_HDR_LEN);
 
     flags = GET_U_1(bp);
     bp += 1;
@@ -78,7 +77,7 @@ vxlan_print(netdissect_options *ndo, const u_char *bp, u_int len)
     ND_TCHECK_1(bp);
     bp += 1;
 
-    ether_print(ndo, bp, len - VXLAN_HDR_LEN, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL);
+    ether_print(ndo, bp, length - VXLAN_HDR_LEN, ND_BYTES_AVAILABLE_AFTER(bp), NULL, NULL);
 
     return;