Fix brew-info when on branch master and github.user set

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Library/Homebrew/cmd/info.rb

@@ -26,7 +26,7 @@ module Homebrew extend self
     if system "/usr/bin/which -s git"
       gh_user=`git config --global github.user 2>/dev/null`.chomp
       /^\*\s*(.*)/.match(`git --git-dir=#{HOMEBREW_REPOSITORY}/.git branch 2>/dev/null`)
-      unless $1.nil? || $1.empty? || gh_user.empty?
+      unless $1.nil? || $1.empty? || $1.chomp == 'master' || gh_user.empty?
         branch = $1.chomp
         user = gh_user
       end