bottle: remove unused variable.

Library/Homebrew/cmd/bottle.rb

@@ -52,8 +52,6 @@ module Homebrew
     result = false
 
     keg.each_unique_file_matching(string) do |file|
-      put_filename = false
-
       # Check dynamic library linkage. Importantly, do not run otool on static
       # libraries, which will falsely report "linkage" to themselves.
       if file.mach_o_executable? or file.dylib? or file.mach_o_bundle?