finally got it right


git-svn-id: https://asn1c.svn.sourceforge.net/svnroot/asn1c/trunk@1117 59561ff5-6e30-0410-9f3c-9617f08c8826
diff --git a/skeletons/ber_tlv_length.c b/skeletons/ber_tlv_length.c
index 2baa1a1..5edd352 100644
--- a/skeletons/ber_tlv_length.c
+++ b/skeletons/ber_tlv_length.c
@@ -51,6 +51,7 @@
 		}
 
 		if(oct == 0) {
+			ber_tlv_len_t lenplusepsilon = len + 1024;
 			/*
 			 * Here length may be very close or equal to 2G.
 			 * However, the arithmetics used in some decoders
@@ -58,7 +59,7 @@
 			 * to check the resulting value against some limits.
 			 * This may result in integer wrap-around.
 			 */
-			if((len + 1024) < len - 1024) {
+			if(lenplusepsilon < 0) {
 				/* Too large length value */
 				return -1;
 			}