man: remove an unnecessary `else`

`odie` causes the process to exit immediately, so there's no need for the
`regenerate_man_pages` call to be conditional.

Library/Homebrew/dev-cmd/man.rb

@@ -23,10 +23,10 @@ module Homebrew
 
     if ARGV.flag? "--link"
       odie "`brew man --link` is now done automatically by `brew update`."
-    else
-      regenerate_man_pages
     end
 
+    regenerate_man_pages
+
     if system "git", "-C", HOMEBREW_REPOSITORY, "diff", "--quiet", "docs/brew.1.html", "manpages"
       puts "No changes to manpage output detected."
     elsif ARGV.include?("--fail-if-changed")