srtp msvc updates and cleanup

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@1087 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/srtp/crypto/include/aes_icm.h

@@ -19,7 +19,7 @@ typedef struct {
   v128_t   offset;                 /* initial offset value             */
   v128_t   keystream_buffer;       /* buffers bytes of keystream       */
   aes_expanded_key_t expanded_key; /* the cipher key                   */
-  int      bytes_in_buffer;        /* number of unused bytes in buffer */
+  unsigned int      bytes_in_buffer;        /* number of unused bytes in buffer */
 } aes_icm_ctx_t;