Move to eol before re-search-backward in clojure-find-ns

Moving to end of line avoids improper matching behavior due to being in middle
of match.

Fix clojure-emacs/cider#2100

Author: xiongtx

clojure-mode.el

@@ -1764,7 +1764,8 @@ no namespaces above point, return the first one in the buffer."
     (save-restriction
       (widen)
       ;; The closest ns form above point.
-      (when (or (re-search-backward clojure-namespace-name-regex nil t)
+      (when (or (and (move-end-of-line 1)
+                     (re-search-backward clojure-namespace-name-regex nil t))
                 ;; Or any form at all.
                 (and (goto-char (point-min))
                      (re-search-forward clojure-namespace-name-regex nil t)))