added stack checking into ber_skip_length also

diff --git a/skeletons/constr_CHOICE.c b/skeletons/constr_CHOICE.c
index ab15846..4db6d7b 100644
--- a/skeletons/constr_CHOICE.c
+++ b/skeletons/constr_CHOICE.c
@@ -209,7 +209,7 @@
 				ASN_DEBUG("Skipping unknown tag %s",
 					ber_tlv_tag_string(tlv_tag));
 
-				skip = ber_skip_length(
+				skip = ber_skip_length(opt_codec_ctx,
 					BER_TLV_CONSTRUCTED(ptr),
 					(char *)ptr + tag_len, LEFT - tag_len);