patman: Resolve python string vs. regex escaping syntax

Python strings have their own notion of backslash-escaping, and that can
conflict with the intentions for strings passed to the 're' module. In
particular, I get warnings like this:

tools/patman/../patman/commit.py:9: SyntaxWarning: invalid escape sequence '\s'
  re_subject_tag = re.compile('([^:\s]*):\s*(.*)')

We should use a raw string (r'...') so that all escaping is passed into
the regex module, not interpreted within the string itself.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

tools/patman/commit.py

@@ -6,7 +6,7 @@ import collections
 import re
 
 # Separates a tag: at the beginning of the subject from the rest of it
-re_subject_tag = re.compile('([^:\s]*):\s*(.*)')
+re_subject_tag = re.compile(r'([^:\s]*):\s*(.*)')
 
 class Commit:
     """Holds information about a single commit/patch in the series.