Fix for a "file handler" leak in native openPort method.

This bug leads to VM crashes (at least on Linux) when the number
of "leaked" handlers goes over 1024 and a select is made on one of
them (for example during readBytes).

src/cpp/_nix_based/jssc.cpp

@@ -72,6 +72,7 @@ JNIEXPORT jlong JNICALL Java_jssc_SerialNativeInterface_openPort(JNIEnv *env, jo
             fcntl(hComm, F_SETFL, flags);
         }
         else {
+            close(hComm);
             hComm = jssc_SerialNativeInterface_ERR_INCORRECT_SERIAL_PORT;//-4;
         }
         delete settings;

src/cpp/windows/jssc.c++

@@ -57,6 +57,7 @@ JNIEXPORT jlong JNICALL Java_jssc_SerialNativeInterface_openPort(JNIEnv *env, jo
     if(hComm != INVALID_HANDLE_VALUE){
     	DCB *dcb = new DCB();
     	if(!GetCommState(hComm, dcb)){
+    		CloseHandle(hComm);
     		hComm = (HANDLE)jssc_SerialNativeInterface_ERR_INCORRECT_SERIAL_PORT;//(-4)Incorrect serial port
     	}
     	delete dcb;