Fix typo causing build error on Windows when building without TLS support.

Thanks to TimmvonderMehden.

Closes #1264.

ChangeLog.txt

@@ -15,6 +15,10 @@ Broker:
 - Fix Will message for a persistent client not being sent on disconnect.
   Closes #1273.
 
+Client library:
+- Fix typo causing build error on Windows when building without TLS support.
+  Closes #1264.
+
 Clients:
 - Fix -L url parsing when `/topic` part is missing.
 - Stop some error messages being printed even when `--quiet` was used.

lib/util_mosq.c

@@ -331,7 +331,7 @@ int util__random_bytes(void *bytes, int count)
 		rc = MOSQ_ERR_SUCCESS;
 	}
 #elif defined(WIN32)
-	HRYPTPROV provider;
+	HCRYPTPROV provider;
 
 	if(!CryptAcquireContext(&provider, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)){
 		return MOSQ_ERR_UNKNOWN;