Update libsrtp to 1.5.2

srtp/srtp/srtp.c

 /*
  * srtp.c
  *
  * the secure real-time transport protocol
  *
  * David A. McGrew
  * Cisco Systems, Inc.
  */
 /*
  *      
@@ skipping 1072 matching lines @@
      * We pass the tag down to the cipher when doing GCM mode 
      */
     enc_octet_len = (unsigned int)(*pkt_octet_len - 
                                    ((uint8_t*)enc_start - (uint8_t*)hdr));
 
     /*
      * Sanity check the encrypted payload length against
      * the tag size.  It must always be at least as large
      * as the tag length.
      */
-    if (enc_octet_len < tag_len) {
+    if (enc_octet_len < (unsigned int) tag_len) {
         return err_status_cipher_fail;
     }
 
     /*
      * update the key usage limit, and check it to make sure that we
      * didn't just hit either the soft limit or the hard limit, and call
      * the event handler if we hit either.
      */
     switch (key_limit_update(stream->limit)) {
     case key_event_normal:
@@ skipping 1767 matching lines @@
       return err_status_no_ctx;
     } 
   }
   
   /* get tag length from stream context */
   tag_len = auth_get_tag_length(stream->rtcp_auth);
 
   /* check the packet length - it must contain at least a full RTCP
      header, an auth tag (if applicable), and the SRTCP encrypted flag
      and 31-bit index value */
-  if (*pkt_octet_len < (octets_in_rtcp_header + tag_len + sizeof(srtcp_trailer_t))) {
+  if (*pkt_octet_len < (int) (octets_in_rtcp_header + tag_len + sizeof(srtcp_trailer_t))) {
     return err_status_bad_param;
   }
 
   /*
    * Check if this is an AEAD stream (GCM mode).  If so, then dispatch
    * the request to our AEAD handler.
    */
   if (stream->rtp_cipher->algorithm == AES_128_GCM ||
       stream->rtp_cipher->algorithm == AES_256_GCM) {
       return srtp_unprotect_rtcp_aead(ctx, stream, srtcp_hdr, (unsigned int*)pkt_octet_len);
@@ skipping 324 matching lines @@
     break;
   case srtp_profile_aes256_cm_sha1_32:
     return 14;
     break;
     /* the following profiles are not (yet) supported */
   case srtp_profile_null_sha1_32:
   default:
     return 0;  /* indicate error by returning a zero */
   }
 }