Bug 1003929: Remove some useless declarations in netwerk/srtp found by scan-build, the LLVM/Clang static analyzer. r=mcmanus

netwerk/srtp/src/crypto/replay/rdbx.c

@@ -132,16 +132,10 @@ index_guess(const xtd_seq_num_t *local,
   uint32_t local_roc = (uint32_t)(*local >> 16);
   uint16_t local_seq = (uint16_t) *local;
 #endif
-#ifdef NO_64BIT_MATH
-  uint32_t guess_roc = ((high32(*guess) << 16) |
-						(low32(*guess) >> 16));
-  uint16_t guess_seq = (uint16_t) (low32(*guess));
-#else
-  uint32_t guess_roc = (uint32_t)(*guess >> 16);
-  uint16_t guess_seq = (uint16_t) *guess;  
-#endif
+  uint32_t guess_roc;
+  uint16_t guess_seq;
   int difference;
-  
+
   if (local_seq < seq_num_median) {
     if (s - local_seq > seq_num_median) {
       guess_roc = local_roc - 1;
@@ -160,7 +154,7 @@ index_guess(const xtd_seq_num_t *local,
     }
   }
   guess_seq = s;
-  
+
   /* Note: guess_roc is 32 bits, so this generates a 48-bit result! */
 #ifdef NO_64BIT_MATH
   *guess = make64(guess_roc >> 16,

netwerk/srtp/src/srtp/ekt.c

@@ -166,7 +166,6 @@ srtp_stream_init_from_ekt(srtp_stream_t stream,
   err_status_t err;
   const uint8_t *master_key;
   srtp_policy_t srtp_policy;
-  unsigned master_key_len;
   uint32_t roc;
 
   /*
@@ -178,7 +177,6 @@ srtp_stream_init_from_ekt(srtp_stream_t stream,
 
   if (stream->ekt->data->ekt_cipher_type != EKT_CIPHER_AES_128_ECB)
     return err_status_bad_param;
-  master_key_len = 16;
 
   /* decrypt the Encrypted Master Key field */
   master_key = srtcp_packet_get_emk_location(srtcp_hdr, pkt_octet_len);