x509parse_crt() now better handles PEM error situations

Because of new pem_read_buffer() handling of when it writes use_len,
x509parse_crt() is able to better handle situations where a PEM blob
results in an error but the other blobs can still be parsed.
diff --git a/ChangeLog b/ChangeLog
index 53a6095..59be48b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -9,6 +9,7 @@
      supports secure renegotiation
    * Fixed offset for cert_type list in ssl_parse_certificate_request()
    * Fixed const correctness issues that have no impact on the ABI
+   * x509parse_crt() now better handles PEM error situations
 
 = Version 1.2.7 released 2013-04-13
 Features