largefiles: preserve the exit status of the forget command

This maintains the exit codes documented in commands.py.

hgext/largefiles/overrides.py

@@ -894,7 +894,7 b' def overridefetch(orig, ui, repo, *pats,'
 
 def overrideforget(orig, ui, repo, *pats, **opts):
     installnormalfilesmatchfn(repo[None].manifest())
-    orig(ui, repo, *pats, **opts)
+    result = orig(ui, repo, *pats, **opts)
     restorematchfn()
     m = scmutil.match(repo[None], pats, opts)
 
@@ -911,6 +911,7 b' def overrideforget(orig, ui, repo, *pats'
                 os.path.isdir(m.rel(lfutil.standin(f))):
             ui.warn(_('not removing %s: file is already untracked\n')
                     % m.rel(f))
+            result = 1
 
     for f in forget:
         if ui.verbose or not m.exact(f):
@@ -932,6 +933,8 b' def overrideforget(orig, ui, repo, *pats'
     finally:
         wlock.release()
 
+    return result
+
 def getoutgoinglfiles(ui, repo, dest=None, **opts):
     dest = ui.expandpath(dest or 'default-push', dest or 'default')
     dest, branches = hg.parseurl(dest, opts.get('branch'))

tests/test-largefiles.t

@@ -116,6 +116,9 b' Remove both largefiles and normal files.'
   $ hg remove large1-test
   not removing large1-test: file is untracked
   [1]
+  $ hg forget large1-test
+  not removing large1-test: file is already untracked
+  [1]
   $ rm large1-test
 
 Copy both largefiles and normal files (testing that status output is correct).