added const qualifier


git-svn-id: https://asn1c.svn.sourceforge.net/svnroot/asn1c/trunk@801 59561ff5-6e30-0410-9f3c-9617f08c8826
diff --git a/skeletons/BMPString.c b/skeletons/BMPString.c
index 10469ed..42b84f6 100644
--- a/skeletons/BMPString.c
+++ b/skeletons/BMPString.c
@@ -79,7 +79,7 @@
 asn_dec_rval_t
 BMPString_decode_xer(asn_codec_ctx_t *opt_codec_ctx,
 	asn_TYPE_descriptor_t *td, void **sptr,
-		const char *opt_mname, void *buf_ptr, size_t size) {
+		const char *opt_mname, const void *buf_ptr, size_t size) {
 	asn_dec_rval_t rc;
 
 	rc = OCTET_STRING_decode_xer_utf8(opt_codec_ctx, td, sptr, opt_mname,