Dependency.expand: ensure pop stack

During the dependencies expansion, there may be errors (e.g. FormulaUnavaiableError).
As result, some deps will be left behind in the stack and interfere afterwards
dependencies expansion.

So let's ensure stack clean for each expansions.

Fixes Homebrew/homebrew#48834.

1 files changed, 2 insertions, 1 deletions

diff --git a/Library/Homebrew/dependency.rb b/Library/Homebrew/dependency.rb
index ca500faef..c280034a8 100644
--- a/Library/Homebrew/dependency.rb
+++ b/Library/Homebrew/dependency.rb
@@ -95,8 +95,9 @@ class Dependency
         end
       end
 
-      @expand_stack.pop
       merge_repeats(expanded_deps)
+    ensure
+      @expand_stack.pop
     end
 
     def action(dependent, dep, &_block)