largefiles: preserve exit code from outgoing command (issue3611)

This maintains the exit codes documented in commands.py.

hgext/largefiles/overrides.py

@@ -968,7 +968,7 b' def getoutgoinglfiles(ui, repo, dest=Non'
     return toupload
 
 def overrideoutgoing(orig, ui, repo, dest=None, **opts):
-    orig(ui, repo, dest, **opts)
+    result = orig(ui, repo, dest, **opts)
 
     if opts.pop('large', None):
         toupload = getoutgoinglfiles(ui, repo, dest, **opts)
@@ -980,6 +980,8 b' def overrideoutgoing(orig, ui, repo, des'
                 ui.status(lfutil.splitstandin(file) + '\n')
             ui.status('\n')
 
+    return result
+
 def overridesummary(orig, ui, repo, *pats, **opts):
     try:
         repo.lfstatus = True

tests/test-largefiles.t

@@ -1144,6 +1144,15 b' vanilla clients locked out from largefil'
 largefiles can be pushed locally (issue3583)
   $ hg init dest
   $ cd r4
+  $ hg outgoing ../dest
+  comparing with ../dest
+  searching for changes
+  changeset:   0:639881c12b4c
+  tag:         tip
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  summary:     m1
+  
   $ hg push ../dest
   pushing to ../dest
   searching for changes
@@ -1152,6 +1161,13 b' largefiles can be pushed locally (issue3'
   adding manifests
   adding file changes
   added 1 changesets with 1 changes to 1 files
+ 
+exit code with nothing outgoing (issue3611)
+  $ hg outgoing ../dest
+  comparing with ../dest
+  searching for changes
+  no changes found
+  [1]
   $ cd ..
 
 #if serve