Fixed strncpy isssue, should copy "\0" too

Signed-off-by: Austin Yuan <shengquan.yuan@intel.com>

src/va.c

@@ -143,7 +143,7 @@ static VAStatus va_openDriver(VADisplay dpy, char *driver_name)
         char *driver_path = (char *) malloc( strlen(driver_dir) +
                                              strlen(driver_name) +
                                              strlen(DRIVER_EXTENSION) + 2 );
-        strncpy( driver_path, driver_dir, strlen(driver_dir) );
+        strncpy( driver_path, driver_dir, strlen(driver_dir) + 1);
         strncat( driver_path, "/", strlen("/") );
         strncat( driver_path, driver_name, strlen(driver_name) );
         strncat( driver_path, DRIVER_EXTENSION, strlen(DRIVER_EXTENSION) );