Fix go to init function in helm-spacemacs

The function may fail when looking for an init function in
the current buffer.

spacemacs/extensions/helm-spacemacs/helm-spacemacs.el

@@ -113,6 +113,7 @@
                           layer)))
            (filename (concat path "packages.el")))
       (find-file filename)
+      (goto-char (point-min))
       (re-search-forward (format "init-%s" package))
       (beginning-of-line))))