Merge pull request #6 from ARMmbed/random_fix

random fix

Author: Tero Heinonen

module.json

@@ -1,6 +1,6 @@
 {
   "name": "coap-service",
-  "version": "1.0.1",
+  "version": "1.0.2",
   "description": "CoAP Service library",
   "keywords": [
     "coap",

source/coap_security_handler.c

@@ -395,7 +395,7 @@ int entropy_poll( void *ctx, unsigned char *output, size_t len,
     }
     memset(c, 0, len);
     for(uint16_t i=0; i < len; i++){
-        *(c + 1) = (char)randLIB_get_8bit();
+        *(c + i) = (char)randLIB_get_8bit();
     }
     memmove(output, c, len);
     *olen = len;