scmutil: drop unreachable except clause

socket.error is a subclass of IOError, which we catch higher up. It
seems to have been this way since 020a896a5292 (dispatch: sort
exception handlers, 2009-01-12), so let's celebrate the 10 year
anniversary (a few days late) of it being wrong by deleting it.

Differential Revision: https://phab.mercurial-scm.org/D5626

mercurial/scmutil.py

@@ -12,7 +12,6 b' import glob'
 import hashlib
 import os
 import re
-import socket
 import subprocess
 import weakref
 
@@ -270,8 +269,6 b' def callcatch(ui, func):'
         # Commands shouldn't sys.exit directly, but give a return code.
         # Just in case catch this and and pass exit code to caller.
         return inst.code
-    except socket.error as inst:
-        ui.error(_("abort: %s\n") % stringutil.forcebytestr(inst.args[-1]))
 
     return -1