Fix diff-hl-highlight function is set to nil

CHANGELOG.develop

@@ -1996,11 +1996,14 @@ Benner and Paweł Siudak):
     - ~SPC g v v~ to do the next logical VC operation (=vc-next-action=)
     - ~SPC g v I~ to ignore file (=vc-ignore=)
     - ~SPC g v r~ to  resolve conflicts in file
-  - Define key bindings with leader key for vim editing style in =diff-mode= (thanks to miyabinomuratic)
+  - Define key bindings with leader key for vim editing style in =diff-mode=
+    (thanks to miyabinomuratic)
 - New packages:
   - =browse-at-remote= which replaces =github-browse-file=
    (thanks Eugene Yaremenko)
 - Avoid loading all the diff packages (thanks to Sylvain Benner)
+- Fixes error on =diff-hl-margin-mode= function being nil during startup (thanks
+  to Voleking)
 **** Ycmd
 - Search for =compile_commands.json= in build sub-directory
   (thanks to Amos Bird and Eivind Fonn)

layers/+source-control/version-control/packages.el

@@ -135,8 +135,7 @@
     (progn
       (spacemacs|do-after-display-system-init
        (setq diff-hl-side (if (eq version-control-diff-side 'left)
-                              'left 'right))
-       (diff-hl-margin-mode -1)))))
+                              'left 'right))))))
 
 (defun version-control/post-init-evil-unimpaired ()
   (define-key evil-normal-state-map (kbd "[ h") 'spacemacs/vcs-previous-hunk)