fix: remove a never-true check for unset pattern in Fixer.affects()

We don't create an instance of a Fixer if the pattern is None, so we
don't need to check that in affects().

Differential Revision: https://phab.mercurial-scm.org/D7086

hgext/fix.py

@@ -843,9 +843,7 b' class Fixer(object):'
 
     def affects(self, opts, fixctx, path):
         """Should this fixer run on the file at the given path and context?"""
-        return self._pattern is not None and scmutil.match(
-            fixctx, [self._pattern], opts
-        )(path)
+        return scmutil.match(fixctx, [self._pattern], opts)(path)
 
     def shouldoutputmetadata(self):
         """Should the stdout of this fixer start with JSON and a null byte?"""