vcardparser.c: also include the errstr

Author: ksmurchison

Diff for: src/libicalvcard/vcardparser.c

@@ -1026,7 +1026,8 @@ vcardcomponent *vcardparser_parse_string(const char *str)
         }
     }
     else {
-        fprintf(stderr, "vcardparser_parse_string() failed:\n%s\n",
+        fprintf(stderr, "vcardparser_parse_string() failed: %s\n%s\n",
+                vcardparser_errstr(r),
                 vcardcomponent_as_vcard_string(parser.root));
     }