logcmdutil: create hunksfilter and filematcher even if no diff option given

It's okay since 5fe6f946f111, "log: allow matchfn to be non-null even if both
--patch/--stat are off."

mercurial/commands.py

@@ -3431,7 +3431,7 b' def log(ui, repo, *pats, **opts):'
         revs, lrfilematcher, hunksfilter = logcmdutil.getlinerangerevs(
             repo, revs, opts)
 
-        if filematcher is not None and lrfilematcher is not None:
+        if filematcher is not None:
             basefilematcher = filematcher
 
             def filematcher(rev):

mercurial/logcmdutil.py

@@ -792,11 +792,9 b' def getlinerangerevs(repo, userrevs, opt'
 
     "filematcher(ctx) -> match" is a factory function returning a match object
     for a given revision for file patterns specified in --line-range option.
-    If neither --stat nor --patch options are passed, "filematcher" is None.
 
     "hunksfilter(ctx) -> filterfn(fctx, hunks)" is a factory function
     returning a hunks filtering function.
-    If neither --stat nor --patch options are passed, "filterhunks" is None.
     """
     wctx = repo[None]
 
@@ -815,10 +813,6 b' def getlinerangerevs(repo, userrevs, opt'
                 rev, {}).setdefault(
                     fctx.path(), []).append(linerange)
 
-    filematcher = None
-    hunksfilter = None
-    if opts.get('patch') or opts.get('stat'):
-
         def nofilterhunksfn(fctx, hunks):
             return hunks