scm: git: use block to call revisions() in unit adapter test_revisions_invalid_rev() (#7146).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@5787 e93f8b46-1217-0410-a6f0-8f06a7374b81

test/unit/lib/redmine/scm/adapters/git_adapter_test.rb

@@ -188,11 +188,13 @@ begin
       end
 
       def test_revisions_invalid_rev
-        revs1 = nil
+        revs1 = []
-        revs1 = @adapter.revisions('',
+        @adapter.revisions('',
                                     '1234abcd',
                                     "master",
-                                    {:reverse => true})
+                                    {:reverse => true}) do |rev|
+          revs1 << rev
+        end
         assert_equal [], revs1
       end