checkpatch: Fix mis-flagging of division operators as lacking whitespace.

The regular expression here would flag any slash that wasn't adjacent to
an asterisk as missing whitespace.  This fixes the problem.

Signed-off-by: Ben Pfaff <blp@ovn.org>
Tested-by: Aaron Conole <aconole@redhat.com>

utilities/checkpatch.py

@@ -472,7 +472,7 @@ infix_operators = \
             '&=', '^=', '|=', '<<=', '>>=']] \
     + ['[^<" ]<[^=" ]', '[^->" ]>[^=" ]', '[^ !()/"]\*[^/]', '[^ !&()"]&',
        '[^" +(]\+[^"+;]', '[^" -(]-[^"->;]', '[^" <>=!^|+\-*/%&]=[^"=]',
-       '[^*]/[^*]']
+       '[^* ]/[^* ]']
 checks += [
     {'regex': '(\.c|\.h)(\.in)?$', 'match_name': None,
      'prereq': lambda x: not is_comment_line(x),