lint: appease eastwood warning

From eastwood:
test/rewrite_clj/zip/test_helper.cljc:57:1: performance {:kind :recur}:  recur arg for primitive local: rows is not matching primitive, had: Object, needed: long

Could turn this linter off, but whatevs for now.

Author: lread

test/rewrite_clj/zip/test_helper.cljc

@@ -54,7 +54,7 @@
       (inc rows)
       (cond
         (z/linebreak? zloc)
-        (recur (z/prev* zloc) (+ rows (z/length zloc)))
+        (recur (z/prev* zloc) (long (+ rows (z/length zloc))))
 
         (n/comment? (z/node zloc))
         (recur (z/prev* zloc) (inc rows))