Update NSPR to 4.12 and NSS to 3.23 on iOS

nss/lib/pki/certificate.c

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #ifndef NSSPKI_H
 #include "nsspki.h"
 #endif /* NSSPKI_H */
 
 #ifndef PKIT_H
 #include "pkit.h"
@@ skipping 1104 matching lines @@
     /* XXX should choose instance based on some criteria */
     status = nssCryptokiCRL_GetAttributes(object->instances[0],
                                           NULL,  /* XXX sessionOpt */
                                           arena,
                                           &rvCRL->encoding,
                                           NULL, /* subject */
                                           NULL, /* class */
                                           &rvCRL->url,
                                           &rvCRL->isKRL);
     if (status != PR_SUCCESS) {
+        if (!arena) {
+            nssPKIObject_Destroy((nssPKIObject *)rvCRL);
+        }
         return (NSSCRL *)NULL;
     }
     return rvCRL;
 }
 
 NSS_IMPLEMENT NSSCRL *
 nssCRL_AddRef (
   NSSCRL *crl
 )
 {
@@ skipping 27 matching lines @@
 nssCRL_GetEncoding (
   NSSCRL *crl
 )
 {
     if (crl && crl->encoding.data != NULL && crl->encoding.size > 0) {
         return &crl->encoding;
     } else {
         return (NSSDER *)NULL;
     }
 }