[PATCH] comedi: convert_csv_to_c.py: use r-string for a regex expression

[Mauro Carvalho Chehab]

Modern Python versions complain about usage of "\" inside normal
strings, as they should use r-string notation.

Change the annotations there to avoid such warnings:

	drivers/comedi/drivers/ni_routing/tools/convert_csv_to_c.py:47: SyntaxWarning: invalid escape sequence '\('

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
---
 drivers/comedi/drivers/ni_routing/tools/convert_csv_to_c.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/comedi/drivers/ni_routing/tools/convert_csv_to_c.py b/drivers/comedi/drivers/ni_routing/tools/convert_csv_to_c.py
index 90378fb50580..d19101fc2a94 100755
--- a/drivers/comedi/drivers/ni_routing/tools/convert_csv_to_c.py
+++ b/drivers/comedi/drivers/ni_routing/tools/convert_csv_to_c.py
@@ -44,7 +44,7 @@ def routedict_to_structinit_single(name, D, return_name=False):
 
     lines.append('\t\t[B({})] = {{'.format(D0_sig))
     for D1_sig, value in D1:
-      if not re.match('[VIU]\([^)]*\)', value):
+      if not re.match(r'[VIU]\([^)]*\)', value):
         sys.stderr.write('Invalid register format: {}\n'.format(repr(value)))
         sys.stderr.write(
           'Register values should be formatted with V(),I(),or U()\n')
-- 
2.48.1