FS-11816: [Build-System] Update libsrtp to 2.2.0

libs/srtp/crypto/include/alloc.h

@@ -1,32 +1,32 @@
 /*
  * alloc.h
  *
- * interface to memory allocation and deallocation, with optional debugging 
+ * interface to memory allocation and deallocation, with optional debugging
  *
  * David A. McGrew
  * Cisco Systems, Inc.
  */
 /*
- *	
+ *
  * Copyright (c) 2001-2017 Cisco Systems, Inc.
  * All rights reserved.
- * 
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
- * 
+ *
  *   Redistributions of source code must retain the above copyright
  *   notice, this list of conditions and the following disclaimer.
- * 
+ *
  *   Redistributions in binary form must reproduce the above
  *   copyright notice, this list of conditions and the following
  *   disclaimer in the documentation and/or other materials provided
  *   with the distribution.
- * 
+ *
  *   Neither the name of the Cisco Systems, Inc. nor the names of its
  *   contributors may be used to endorse or promote products derived
  *   from this software without specific prior written permission.
- * 
+ *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
@@ -42,7 +42,6 @@
  *
  */
 
-
 #ifndef CRYPTO_ALLOC_H
 #define CRYPTO_ALLOC_H
 
@@ -52,8 +51,22 @@
 extern "C" {
 #endif
 
-void * srtp_crypto_alloc(size_t size);
+/*
+ * srtp_crypto_alloc
+ *
+ * Allocates a block of memory  of given size. The memory will be
+ * initialized to zero's. Free the memory with a call to srtp_crypto_free.
+ *
+ * returns pointer to memory on success or else NULL
+ */
+void *srtp_crypto_alloc(size_t size);
 
+/*
+ * srtp_crypto_free
+ *
+ * Frees the block of memory  ptr previously  allocated with
+ * srtp_crypto_alloc
+ */
 void srtp_crypto_free(void *ptr);
 
 #ifdef __cplusplus