fix a typerr in bach_complete.

src/scripts/bash_completion

 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Add programmable completion to some Chromium OS build scripts
 
 
 # Echo a list of -- flags that the current command accepts. The
 # function assumes that the command supports shflags' --help flag.
 #
@@ skipping 71 matching lines @@
     return 0
   fi
   return 1
 }
 
 # Completion for --board= argument for existing board sysroots
 #
 _board_sysroot()
 {
   _flag_complete && return 0
-  _complete_board_flag && return 0
+  _complete_board_sysroot_flag && return 0
 }
 
 complete -o bashdefault -o default -F _board_sysroot \
   build_autotest.sh \
   build_image \
   build_packages \
   image_to_usb.sh \
   mod_image_for_test.sh
 
 
@@ skipping 46 matching lines @@
   fi
 
   _complete_board_sysroot_flag && return 0
 }
 
 complete -o bashdefault -o default -o nospace -F _autotest_complete autotest
 
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