various: eliminate the usage of `any?` (#638)

`any?` is not the opposite of `empty?`. Besides the case that
`[false, nil].any?` will return false, `any?`(O(n)) has much worse
performance than `empty?`(O(1)).

1 files changed, 1 insertions, 1 deletions

diff --git a/Library/Homebrew/formula_pin.rb b/Library/Homebrew/formula_pin.rb
index c9a195fdd..0650c806f 100644
--- a/Library/Homebrew/formula_pin.rb
+++ b/Library/Homebrew/formula_pin.rb
@@ -31,7 +31,7 @@ class FormulaPin
   end
 
   def pinnable?
-    @f.installed_prefixes.any?
+    !@f.installed_prefixes.empty?
   end
 
   def pinned_version