Fix typo which had broken writing of files (regression from 1.1)

ChangeLog

@@ -1,5 +1,9 @@
 # ChangeLog for replacer
 
+*replacer-1.2
+	Martin Väth <martin at mvath.de>:
+	- Fix typo which had broken writing of files (regression from 1.1)
+
 *replacer-1.1
 	Martin Väth <martin at mvath.de>:
 	- Provide --encoding-fallback

bin/replacer

@@ -90,7 +90,7 @@ def get_parser():
         r'“raw” strings.'
     p = argparse.ArgumentParser(description=d)
     a = p.add_argument
-    a('-V', '--version', action='version', version='%(prog)s 1.1')
+    a('-V', '--version', action='version', version='%(prog)s 1.2')
     a('-B', '--before', type=int, default=0,
       help=r'add lines of context before match')
     a('-A', '--after', type=int, default=0,
@@ -604,7 +604,7 @@ class Action:
             except Exception as e:
                 stat = None
                 warn('cannot get timestamp of {0}: {1}'.format(filename, e))
-        if self._write_encoding_override:
+        if self._encoding_override is not None:
             encoding = self._encoding_override
         else:
             encoding = self._encoding