Fix pylint warning.

************* Module get_concurrent_links
W: 72,11: Unused variable 'args' (unused-variable)

Review-Url: https://codereview.chromium.org/2312023003
Cr-Original-Commit-Position: refs/heads/master@{#416826}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: a1c76e932e290f9bfb6b19e0fcc25536cbccdb56

toolchain/get_concurrent_links.py

@@ -67,7 +67,7 @@ def main():
   parser.add_option('--mem_per_link_gb', action="store", type="int", default=8)
   parser.add_option('--reserve_mem_gb', action="store", type="int", default=0)
   parser.disable_interspersed_args()
-  options, args = parser.parse_args()
+  options, _ = parser.parse_args()
 
   print _GetDefaultConcurrentLinks(options.mem_per_link_gb,
                                    options.reserve_mem_gb)