Revert "shebang: raise error if no rewriting"

This is causing failures when attempting to rewrite shebangs during the
cleanup stage of `brew install`.

See, for example, Homebrew/homebrew-core#94323,
Homebrew/homebrew-core#94321.

This reverts commit 7e6be5eb44.

Library/Homebrew/test/utils/shebang_spec.rb

@@ -1,30 +0,0 @@
-# typed: false
-# frozen_string_literal: true
-
-require "utils/shebang"
-
-describe Utils::Shebang do
-  let(:file) { Tempfile.new("shebang") }
-
-  before do
-    file.write "#!/usr/bin/python"
-    file.flush
-  end
-
-  after { file.unlink }
-
-  describe "rewrite_shebang" do
-    it "rewrites a shebang" do
-      rewrite_info = Utils::Shebang::RewriteInfo.new(/^#!.*python$/, 25, "new_shebang")
-      described_class.rewrite_shebang rewrite_info, file
-      expect(File.read(file)).to eq "#!new_shebang"
-    end
-
-    it "raises an error if no rewriting occurs" do
-      rewrite_info = Utils::Shebang::RewriteInfo.new(/^#!.*perl$/, 25, "new_shebang")
-      expect {
-        described_class.rewrite_shebang rewrite_info, file
-      }.to raise_error("No matching files found to rewrite shebang")
-    end
-  end
-end

Library/Homebrew/utils/shebang.rb

@@ -34,17 +34,13 @@ module Utils
     # @api public
     sig { params(rewrite_info: RewriteInfo, paths: T::Array[T.any(String, Pathname)]).void }
     def rewrite_shebang(rewrite_info, *paths)
-      found = T.let(false, T::Boolean)
       paths.each do |f|
         f = Pathname(f)
         next unless f.file?
         next unless rewrite_info.regex.match?(f.read(rewrite_info.max_length))
 
         Utils::Inreplace.inreplace f.to_s, rewrite_info.regex, "#!#{rewrite_info.replacement}"
-        found = true
       end
-
-      raise "No matching files found to rewrite shebang" unless found
     end
   end
 end