Cast the period to an integer in `demo/python/mmap.py`'s command setup.

This avoids:

   Traceback (most recent call last):
     ...
     File ".../mmap.py", line 96, in prepare_cmd
       C.scan_begin_arg = 1e9/freq
     ...
   TypeError: in method 'comedi_cmd_struct_scan_begin_arg_set',
      argument 2 of type 'unsigned int'

diff --git a/demo/python/mmap.py b/demo/python/mmap.py
index ebab9d780b61d67272cff6c93c46a8ab839d2fa7..98abf147ddb5fd51edfa6c431af1dcec6be9ba93 100755 (executable)
--- a/demo/python/mmap.py
+++ b/demo/python/mmap.py
@@ -93,7 +93,7 @@ def prepare_cmd(dev, subdev, C):
     C.start_src = c.TRIG_NOW
     C.start_arg = 0
     C.scan_begin_src = c.TRIG_TIMER
-    C.scan_begin_arg = 1e9/freq
+    C.scan_begin_arg = int(1e9/freq)
     C.convert_src = c.TRIG_TIMER
     C.convert_arg = 1
     C.scan_end_src = c.TRIG_COUNT