docgen: Fix script.

Apparently caused by previous botched merge commit.

man/docgen

@@ -317,8 +317,10 @@ def read_wikipages():
 
             line = re.sub('\#.*$', '', line)
 
-            if not re.match('^\s*$', line):
+            if not re.match(r'^\s*$', line):
                 wikipages.append(line)
+    finally:
+        f.close()
 
 # Add wiki page links
 
@@ -363,7 +365,7 @@ def process_file(filename):
 
     current_config_file = None
 
-    f = io.open(file, encoding='UTF-8')
+    f = io.open(filename, encoding='UTF-8')
 
     try:
         param = None
@@ -412,6 +414,8 @@ def process_file(filename):
                     # Start of a normal comment
                     param = Parameter()
                     waiting_for_checkparm = False
+    finally:
+        f.close()
 
 def process_files(path):
     # Process all C source files.
@@ -440,9 +444,11 @@ def print_template(template_file, content):
             else:
                 line = line.replace("@content", content)
                 stdout(line.rstrip().encode('UTF-8') + b'\n')
+    finally:
+        f.close()
+
+def manpage_output(targets, template_file):
 
-def manpage_output(targets, template_file): 
-    
     content = ""
 
     for t in targets: