os/mac/linkage_checker: fix Rubocop warnings.

Library/Homebrew/os/mac/linkage_checker.rb

@@ -51,28 +51,28 @@ class LinkageChecker
   end
 
   def check_undeclared_deps
-      filter_out = proc do |dep|
-        next true if dep.build?
-        next false unless dep.optional? || dep.recommended?
-        formula.build.without?(dep)
-      end
-      declared_deps = formula.deps.reject { |dep| filter_out.call(dep) }.map(&:name)
-      declared_requirement_deps = formula.requirements.reject { |req| filter_out.call(req) }.map(&:default_formula).compact
-      declared_dep_names = (declared_deps + declared_requirement_deps).map { |dep| dep.split("/").last }
-      undeclared_deps = @brewed_dylibs.keys.select do |full_name|
-        name = full_name.split("/").last
-        next false if name == formula.name
-        !declared_dep_names.include?(name)
-      end
-      undeclared_deps.sort do |a,b|
-        if a.include?("/") && !b.include?("/")
-          1
-        elsif !a.include?("/") && b.include?("/")
-          -1
-        else
-          a <=> b
-        end
+    filter_out = proc do |dep|
+      next true if dep.build?
+      next false unless dep.optional? || dep.recommended?
+      formula.build.without?(dep)
+    end
+    declared_deps = formula.deps.reject { |dep| filter_out.call(dep) }.map(&:name)
+    declared_requirement_deps = formula.requirements.reject { |req| filter_out.call(req) }.map(&:default_formula).compact
+    declared_dep_names = (declared_deps + declared_requirement_deps).map { |dep| dep.split("/").last }
+    undeclared_deps = @brewed_dylibs.keys.select do |full_name|
+      name = full_name.split("/").last
+      next false if name == formula.name
+      !declared_dep_names.include?(name)
+    end
+    undeclared_deps.sort do |a, b|
+      if a.include?("/") && !b.include?("/")
+        1
+      elsif !a.include?("/") && b.include?("/")
+        -1
+      else
+        a <=> b
       end
+    end
   end
 
   def display_normal_output